change all pix parameters to width for consistency

source/convert_from.cc

Index: source/convert_from.cc
diff --git a/source/convert_from.cc b/source/convert_from.cc
index 347af0746eefe5064876bc49fee19bb52f824a15..89ce79ec25bc45548b0fb329caf71d7a0ac53dc2 100644
--- a/source/convert_from.cc
+++ b/source/convert_from.cc
@@ -1041,7 +1041,7 @@ int I420ToRGB565Dither(const uint8* src_y, int src_stride_y,
                         const struct YuvConstants* yuvconstants,
                         int width) = I422ToARGBRow_C;
   void (*ARGBToRGB565DitherRow)(const uint8* src_argb, uint8* dst_rgb,
-      const uint32 dither4, int pix) = ARGBToRGB565DitherRow_C;
+      const uint32 dither4, int width) = ARGBToRGB565DitherRow_C;
   if (!src_y || !src_u || !src_v || !dst_rgb565 ||
       width <= 0 || height == 0) {
     return -1;