Bug 821495 - Add cast to silence unnecessary data loss compile warning in AudioSampleFormat.h. r=kinetik

content/media/AudioSampleFormat.h

@@ -143,7 +143,7 @@ ScaleAudioSamples(float* aBuffer, int aCount, float aScale)
 inline void
 ScaleAudioSamples(short* aBuffer, int aCount, float aScale)
 {
-  int32_t volume = int32_t(1 << 16) * aScale;
+  int32_t volume = int32_t((1 << 16) * aScale);
   for (int32_t i = 0; i < aCount; ++i) {
     aBuffer[i] = short((int32_t(aBuffer[i]) * volume) >> 16);
   }