Update audio code to use size_t more correctly,

webrtc/common_audio/signal_processing/filter_ma_fast_q12.c

Index: webrtc/common_audio/signal_processing/filter_ma_fast_q12.c
diff --git a/webrtc/common_audio/signal_processing/filter_ma_fast_q12.c b/webrtc/common_audio/signal_processing/filter_ma_fast_q12.c
index afec8393d3a89cba66452d969a943fb774626617..f4d9a3d3038cf1480b4cf7cf8fdf3503245a8881 100644
--- a/webrtc/common_audio/signal_processing/filter_ma_fast_q12.c
+++ b/webrtc/common_audio/signal_processing/filter_ma_fast_q12.c
@@ -20,10 +20,10 @@
 void WebRtcSpl_FilterMAFastQ12(const int16_t* in_ptr,
                                int16_t* out_ptr,
                                const int16_t* B,
-                               int16_t B_length,
-                               int16_t length)
+                               size_t B_length,
+                               size_t length)
 {
-    int i, j;
+    size_t i, j;
     for (i = 0; i < length; i++)
     {
         int32_t o = 0;