Prepare to convert various types to size_t.

webrtc/modules/audio_coding/codecs/isac/fix/test/isac_speed_test.cc

Index: webrtc/modules/audio_coding/codecs/isac/fix/test/isac_speed_test.cc
diff --git a/webrtc/modules/audio_coding/codecs/isac/fix/test/isac_speed_test.cc b/webrtc/modules/audio_coding/codecs/isac/fix/test/isac_speed_test.cc
index bb76257569595d110ba6f6c51430591bab227bba..3089f58261027836c367393e83a910b9fb244576 100644
--- a/webrtc/modules/audio_coding/codecs/isac/fix/test/isac_speed_test.cc
+++ b/webrtc/modules/audio_coding/codecs/isac/fix/test/isac_speed_test.cc
@@ -65,18 +65,21 @@ float IsacSpeedTest::EncodeABlock(int16_t* in_data, uint8_t* bit_stream,
   // ISAC takes 10 ms everycall
   const int subblocks = block_duration_ms_ / 10;
   const int subblock_length = 10 * input_sampling_khz_;
-  int value;
+  int value = 0;
 
   clock_t clocks = clock();
   size_t pointer = 0;
   for (int idx = 0; idx < subblocks; idx++, pointer += subblock_length) {
     value = WebRtcIsacfix_Encode(ISACFIX_main_inst_, &in_data[pointer],
                                  bit_stream);
+    if (idx == subblocks - 1)
+      EXPECT_GT(value, 0);
+    else
+      EXPECT_EQ(0, value);
   }
   clocks = clock() - clocks;
-  EXPECT_GT(value, 0);
-  assert(value <= max_bytes);
   *encoded_bytes = value;
+  assert(*encoded_bytes <= max_bytes);
   return 1000.0 * clocks / CLOCKS_PER_SEC;
 }