Update a ton of audio code to use size_t more correctly and in general reduce

webrtc/modules/audio_coding/codecs/ilbc/decode.c

Index: webrtc/modules/audio_coding/codecs/ilbc/decode.c
diff --git a/webrtc/modules/audio_coding/codecs/ilbc/decode.c b/webrtc/modules/audio_coding/codecs/ilbc/decode.c
index 9918de201ed4ff0e088d6de8f1665422fdb73acc..4c8497a568cc6635adb4a4b34bd525b3cc16d586 100644
--- a/webrtc/modules/audio_coding/codecs/ilbc/decode.c
+++ b/webrtc/modules/audio_coding/codecs/ilbc/decode.c
@@ -44,7 +44,7 @@ void WebRtcIlbcfix_DecodeImpl(
     int16_t mode      /* (i) 0: bad packet, PLC,
                                                                    1: normal */
                            ) {
-  int i;
+  size_t i;
   int16_t order_plus_one;
 
   int16_t last_bit;
@@ -106,7 +106,7 @@ void WebRtcIlbcfix_DecodeImpl(
       WebRtcIlbcfix_DoThePlc(
           PLCresidual, PLClpc, 0, decresidual,
           syntdenum + (LPC_FILTERORDER + 1) * (iLBCdec_inst->nsub - 1),
-          (int16_t)(iLBCdec_inst->last_lag), iLBCdec_inst);
+          iLBCdec_inst->last_lag, iLBCdec_inst);
 
       /* Use the output from doThePLC */
       WEBRTC_SPL_MEMCPY_W16(decresidual, PLCresidual, iLBCdec_inst->blockl);
@@ -122,7 +122,7 @@ void WebRtcIlbcfix_DecodeImpl(
     /* packet loss conceal */
 
     WebRtcIlbcfix_DoThePlc(PLCresidual, PLClpc, 1, decresidual, syntdenum,
-                           (int16_t)(iLBCdec_inst->last_lag), iLBCdec_inst);
+                           iLBCdec_inst->last_lag, iLBCdec_inst);
 
     WEBRTC_SPL_MEMCPY_W16(decresidual, PLCresidual, iLBCdec_inst->blockl);
 
@@ -188,18 +188,18 @@ void WebRtcIlbcfix_DecodeImpl(
     WEBRTC_SPL_MEMCPY_W16(iLBCdec_inst->syntMem, &data[iLBCdec_inst->blockl-LPC_FILTERORDER], LPC_FILTERORDER);
 
   } else { /* Enhancer not activated */
-    int16_t lag;
+    size_t lag;
 
     /* Find last lag (since the enhancer is not called to give this info) */
     lag = 20;
     if (iLBCdec_inst->mode==20) {
-      lag = (int16_t)WebRtcIlbcfix_XcorrCoef(
+      lag = WebRtcIlbcfix_XcorrCoef(
           &decresidual[iLBCdec_inst->blockl-60],
           &decresidual[iLBCdec_inst->blockl-60-lag],
           60,
           80, lag, -1);
     } else {
-      lag = (int16_t)WebRtcIlbcfix_XcorrCoef(
+      lag = WebRtcIlbcfix_XcorrCoef(
           &decresidual[iLBCdec_inst->blockl-ENH_BLOCKL],
           &decresidual[iLBCdec_inst->blockl-ENH_BLOCKL-lag],
           ENH_BLOCKL,