[fuzz] avoid tasklet execution if platform was reset (#4093)

tests/fuzz/ip6_send.cpp

@@ -38,11 +38,9 @@
 #include <openthread/thread.h>
 #include <openthread/thread_ftd.h>
 
+#include "fuzzer_platform.h"
 #include "common/code_utils.hpp"
 
-extern "C" void FuzzerPlatformInit(void);
-extern "C" void FuzzerPlatformProcess(otInstance *aInstance);
-
 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
 {
     const otPanId panId = 0xdead;
@@ -75,6 +73,8 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
 
     message = NULL;
 
+    VerifyOrExit(!FuzzerPlatformResetWasRequested());
+
     for (int i = 0; i < MAX_ITERATIONS; i++)
     {
         while (otTaskletsArePending(instance))