Return after throwing an exception when ConvolerNode.buffer rate is wrong.

Source/modules/webaudio/ConvolverNode.cpp

 /*
  * Copyright (C) 2010, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1.  Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 106 matching lines @@
 
     if (!buffer)
         return;
 
     if (buffer->sampleRate() != context()->sampleRate()) {
         exceptionState.throwDOMException(
             NotSupportedError,
             "The buffer sample rate of " + String::number(buffer->sampleRate())
             + " does not match the context rate of " + String::number(context()->sampleRate())
             + " Hz.");
+        return;
     }
 
     unsigned numberOfChannels = buffer->numberOfChannels();
     size_t bufferLength = buffer->length();
 
     // The current implementation supports up to four channel impulse responses, which are interpreted as true-stereo (see Reverb class).
     bool isBufferGood = numberOfChannels > 0 && numberOfChannels <= 4 && bufferLength;
     ASSERT(isBufferGood);
     if (!isBufferGood)
         return;
@@ skipping 84 matching lines @@
 }
 
 void ConvolverNode::setNormalize(bool normalize)
 {
     convolverHandler().setNormalize(normalize);
 }
 
 } // namespace blink
 
 #endif // ENABLE(WEB_AUDIO)