Fix build warnings

Change-Id: Ife5e40264f43fb3ccb40830228701003fe106bf5
diff --git a/services/audioflinger/AudioResamplerFirProcess.h b/services/audioflinger/AudioResamplerFirProcess.h
index d130013..efc8055 100644
--- a/services/audioflinger/AudioResamplerFirProcess.h
+++ b/services/audioflinger/AudioResamplerFirProcess.h
@@ -177,7 +177,7 @@
 template <int CHANNELS, int STRIDE, typename TFUNC, typename TC, typename TI, typename TO, typename TINTERP>
 static inline
 void ProcessBase(TO* const out,
-        int count,
+        size_t count,
         const TC* coefsP,
         const TC* coefsN,
         const TI* sP,