Update audio code to use size_t more correctly,

webrtc/modules/audio_coding/codecs/isac/fix/source/decode.c

Index: webrtc/modules/audio_coding/codecs/isac/fix/source/decode.c
diff --git a/webrtc/modules/audio_coding/codecs/isac/fix/source/decode.c b/webrtc/modules/audio_coding/codecs/isac/fix/source/decode.c
index d0c59d687851708402e05f74fd84198a32113cb6..e3de437a58ded933ab1edf68b4dd9b61bec2a4f0 100644
--- a/webrtc/modules/audio_coding/codecs/isac/fix/source/decode.c
+++ b/webrtc/modules/audio_coding/codecs/isac/fix/source/decode.c
@@ -29,7 +29,7 @@
 
 int WebRtcIsacfix_DecodeImpl(int16_t* signal_out16,
                              IsacFixDecoderInstance* ISACdec_obj,
-                             int16_t* current_framesamples)
+                             size_t* current_framesamples)
 {
   int k;
   int err;
@@ -58,9 +58,9 @@ int WebRtcIsacfix_DecodeImpl(int16_t* signal_out16,
   int16_t gainQ13;
 
 
-  int16_t frame_nb; /* counter */
-  int16_t frame_mode; /* 0 for 30ms, 1 for 60ms */
-  static const int16_t kProcessedSamples = 480; /* 480 (for both 30, 60 ms) */
+  size_t frame_nb; /* counter */
+  size_t frame_mode; /* 0 for 30ms, 1 for 60ms */
+  static const size_t kProcessedSamples = 480; /* 480 (for both 30, 60 ms) */
 
   /* PLC */
   int16_t overlapWin[ 240 ];