Bug 853963 - Make the case where the listener and panner are at the same spot with 360 cone angles really a no-op; r=padenot

content/media/webaudio/PannerNode.cpp

@@ -237,6 +237,7 @@ PannerNodeEngine::EqualPowerPanningFunction(const AudioChunk& aInput,
       mConeInnerAngle == 360 &&
       mConeOuterAngle == 360) {
     *aOutput = aInput;
+    return;
   }
 
   // The output of this node is always stereo, no matter what the inputs are.