cras_output: Fix calculation of bytes per sample.

media/audio/linux/cras_output.cc

Index: media/audio/linux/cras_output.cc
diff --git a/media/audio/linux/cras_output.cc b/media/audio/linux/cras_output.cc
index e27282c8d8f196191df544e0869ebb4819f45155..c1a9e77c2fd560aa83540bee30ca5345687616ec 100644
--- a/media/audio/linux/cras_output.cc
+++ b/media/audio/linux/cras_output.cc
@@ -285,7 +285,7 @@ uint32 CrasOutputStream::Render(size_t frames,
   // Note: If this ever changes to output raw float the data must be clipped and
   // sanitized since it may come from an untrusted source such as NaCl.
   audio_bus_->ToInterleaved(
-      frames_filled, bytes_per_frame_ / (frames * num_channels_), buffer);
+      frames_filled, bytes_per_frame_ / num_channels_, buffer);
   return frames_filled;
 }