Fix typo in the variable name in NcpBuffer (#979)

src/ncp/ncp_buffer.cpp

@@ -100,7 +100,7 @@ void NcpFrameBuffer::SetCallbacks(BufferCallback aEmptyBufferCallback, BufferCal
                                   void *aContext)
 {
     mEmptyBufferCallback = aEmptyBufferCallback;
-    mNonEmtyBufferCallback = aNonEmptyBufferCallback;
+    mNonEmptyBufferCallback = aNonEmptyBufferCallback;
     mCallbackContext = aContext;
 }
 
@@ -316,9 +316,9 @@ ThreadError NcpFrameBuffer::InFrameEnd(void)
     // If buffer was empty before, invoke the callback to signal that buffer is now non-empty.
     if (wasEmpty)
     {
-        if (mNonEmtyBufferCallback != NULL)
+        if (mNonEmptyBufferCallback != NULL)
         {
-            mNonEmtyBufferCallback(mCallbackContext, this);
+            mNonEmptyBufferCallback(mCallbackContext, this);
         }
     }
 

src/ncp/ncp_buffer.hpp

@@ -329,7 +329,7 @@ private:
     const uint16_t  mBufferLength;              // Length of the the buffer.
 
     BufferCallback  mEmptyBufferCallback;       // Callback to signal when buffer becomes empty.
-    BufferCallback  mNonEmtyBufferCallback;     // Callback to signal when buffer becomes non-empty.
+    BufferCallback  mNonEmptyBufferCallback;    // Callback to signal when buffer becomes non-empty.
     void *          mCallbackContext;           // Context passed to callbacks.
 
     MessageQueue    mMessageQueue;              // Main message queue.