Use non-zero data in AudioRingBufferTest.

TBR=aluebs@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/35909004

Cr-Commit-Position: refs/heads/master@{#8176}
git-svn-id: http://webrtc.googlecode.com/svn/trunk@8176 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/webrtc/common_audio/audio_ring_buffer_unittest.cc b/webrtc/common_audio/audio_ring_buffer_unittest.cc
index ee0e602..3671ce4 100644
--- a/webrtc/common_audio/audio_ring_buffer_unittest.cc
+++ b/webrtc/common_audio/audio_ring_buffer_unittest.cc
@@ -65,7 +65,7 @@
   ChannelBuffer<float> input(kFrames, static_cast<int>(num_channels));
   for (size_t i = 0; i < num_channels; ++i)
     for (size_t j = 0; j < kFrames; ++j)
-      input.channels()[i][j] = i * j;
+      input.channels()[i][j] = (i + 1) * (j + 1);
 
   ChannelBuffer<float> output(kFrames, static_cast<int>(num_channels));
   ReadAndWriteTest(input,