return_thru_ptr: fix Wsign-conversion warning

Compiling a source base / test with Wsign-conversion enabled, gives
the following warning:

build/test/mocks/mock_logMessages.c: In function ‘countLogMessages’:
build/test/mocks/mock_logMessages.c:749:26: warning: conversion to ‘size_t’ {aka ‘long unsigned int’} from ‘int’ may change the sign of the result [-Wsign-conversion]
  749 |       cmock_call_instance->ReturnThruPtr_fileIn_Size);
      |       ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

The ReturnThruPtr_XXX_Size is used as argument to a call to memcpy(),
which expects size_t (unsigned) for a good reason. The size leading
to this call is being determined using sizeof(), so there appears
no reason to ever convert this to (signed) int.

Stop converting size_t to int, and thereby fix the compiler
warning.

Signed-off-by: André Draszik <git@andred.net>

lib/cmock_generator_plugin_return_thru_ptr.rb

@@ -14,7 +14,7 @@ class CMockGeneratorPluginReturnThruPtr
 
       lines << "  char ReturnThruPtr_#{arg[:name]}_Used;\n"
       lines << "  #{arg[:type]} ReturnThruPtr_#{arg[:name]}_Val;\n"
-      lines << "  int ReturnThruPtr_#{arg[:name]}_Size;\n"
+      lines << "  size_t ReturnThruPtr_#{arg[:name]}_Size;\n"
     end
     lines
   end
@@ -33,10 +33,10 @@ class CMockGeneratorPluginReturnThruPtr
                  " #{function[:name]}_CMockReturnMemThruPtr_#{arg[:name]}(__LINE__, #{arg[:name]}, sizeof(*#{arg[:name]}))\n"
                end
       lines << "#define #{function[:name]}_ReturnArrayThruPtr_#{arg[:name]}(#{arg[:name]}, cmock_len)"
-      lines << " #{function[:name]}_CMockReturnMemThruPtr_#{arg[:name]}(__LINE__, #{arg[:name]}, (int)(cmock_len * (int)sizeof(*#{arg[:name]})))\n"
+      lines << " #{function[:name]}_CMockReturnMemThruPtr_#{arg[:name]}(__LINE__, #{arg[:name]}, cmock_len * sizeof(*#{arg[:name]}))\n"
       lines << "#define #{function[:name]}_ReturnMemThruPtr_#{arg[:name]}(#{arg[:name]}, cmock_size)"
       lines << " #{function[:name]}_CMockReturnMemThruPtr_#{arg[:name]}(__LINE__, #{arg[:name]}, cmock_size)\n"
-      lines << "void #{function[:name]}_CMockReturnMemThruPtr_#{arg[:name]}(UNITY_LINE_TYPE cmock_line, #{arg[:type]} #{arg[:name]}, int cmock_size);\n"
+      lines << "void #{function[:name]}_CMockReturnMemThruPtr_#{arg[:name]}(UNITY_LINE_TYPE cmock_line, #{arg[:type]} #{arg[:name]}, size_t cmock_size);\n"
     end
     lines
   end
@@ -48,7 +48,7 @@ class CMockGeneratorPluginReturnThruPtr
       arg_name = arg[:name]
       next unless @utils.ptr_or_str?(arg[:type]) && !(arg[:const?])
 
-      lines << "void #{func_name}_CMockReturnMemThruPtr_#{arg_name}(UNITY_LINE_TYPE cmock_line, #{arg[:type]} #{arg_name}, int cmock_size)\n"
+      lines << "void #{func_name}_CMockReturnMemThruPtr_#{arg_name}(UNITY_LINE_TYPE cmock_line, #{arg[:type]} #{arg_name}, size_t cmock_size)\n"
       lines << "{\n"
       lines << "  CMOCK_#{func_name}_CALL_INSTANCE* cmock_call_instance = " \
                "(CMOCK_#{func_name}_CALL_INSTANCE*)CMock_Guts_GetAddressFor(CMock_Guts_MemEndOfChain(Mock.#{func_name}_CallInstance));\n"

test/unit/cmock_generator_plugin_return_thru_ptr_test.rb

@@ -73,7 +73,7 @@ describe CMockGeneratorPluginReturnThruPtr, "Verify CMockGeneratorPluginReturnTh
     complex_func_expect()
     expected = "  char ReturnThruPtr_tofu_Used;\n" +
                "  int* ReturnThruPtr_tofu_Val;\n" +
-               "  int ReturnThruPtr_tofu_Size;\n"
+               "  size_t ReturnThruPtr_tofu_Size;\n"
     returned = @cmock_generator_plugin_return_thru_ptr.instance_typedefs(@complex_func)
     assert_equal(expected, returned)
   end
@@ -91,10 +91,10 @@ describe CMockGeneratorPluginReturnThruPtr, "Verify CMockGeneratorPluginReturnTh
       "#define Pine_ReturnThruPtr_tofu(tofu)" +
       " Pine_CMockReturnMemThruPtr_tofu(__LINE__, tofu, sizeof(int))\n" +
       "#define Pine_ReturnArrayThruPtr_tofu(tofu, cmock_len)" +
-      " Pine_CMockReturnMemThruPtr_tofu(__LINE__, tofu, (int)(cmock_len * (int)sizeof(*tofu)))\n" +
+      " Pine_CMockReturnMemThruPtr_tofu(__LINE__, tofu, cmock_len * sizeof(*tofu))\n" +
       "#define Pine_ReturnMemThruPtr_tofu(tofu, cmock_size)" +
       " Pine_CMockReturnMemThruPtr_tofu(__LINE__, tofu, cmock_size)\n" +
-      "void Pine_CMockReturnMemThruPtr_tofu(UNITY_LINE_TYPE cmock_line, int* tofu, int cmock_size);\n"
+      "void Pine_CMockReturnMemThruPtr_tofu(UNITY_LINE_TYPE cmock_line, int* tofu, size_t cmock_size);\n"
 
     returned = @cmock_generator_plugin_return_thru_ptr.mock_function_declarations(@complex_func)
     assert_equal(expected, returned)
@@ -104,7 +104,7 @@ describe CMockGeneratorPluginReturnThruPtr, "Verify CMockGeneratorPluginReturnTh
     complex_func_expect();
 
     expected =
-      "void Pine_CMockReturnMemThruPtr_tofu(UNITY_LINE_TYPE cmock_line, int* tofu, int cmock_size)\n" +
+      "void Pine_CMockReturnMemThruPtr_tofu(UNITY_LINE_TYPE cmock_line, int* tofu, size_t cmock_size)\n" +
       "{\n" +
       "  CMOCK_Pine_CALL_INSTANCE* cmock_call_instance = " +
       "(CMOCK_Pine_CALL_INSTANCE*)CMock_Guts_GetAddressFor(CMock_Guts_MemEndOfChain(Mock.Pine_CallInstance));\n" +