In Q420ToI420 the variable halfheight is initialized but not used. Change it to…

In Q420ToI420 the variable halfheight is initialized but not used.  Change it to instantiate the variable but do not initialize it.  It will be assigned conditionally later.  This warning raised in xcode.
BUG=353
TESTED=local build still works
R=harryjin@google.com, noahric@chromium.org

Review URL: https://webrtc-codereview.appspot.com/13299004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@1053 16f28f9a-4ce2-e073-06de-1de4eb20be90

README.chromium

 Name: libyuv
 URL: http://code.google.com/p/libyuv/
-Version: 1052
+Version: 1053
 License: BSD
 License File: LICENSE
 

include/libyuv/version.h

@@ -11,6 +11,6 @@
 #ifndef INCLUDE_LIBYUV_VERSION_H_  // NOLINT
 #define INCLUDE_LIBYUV_VERSION_H_
 
-#define LIBYUV_VERSION 1052
+#define LIBYUV_VERSION 1053
 
 #endif  // INCLUDE_LIBYUV_VERSION_H_  NOLINT

source/convert.cc

@@ -401,7 +401,7 @@ int Q420ToI420(const uint8* src_y, int src_stride_y,
                uint8* dst_v, int dst_stride_v,
                int width, int height) {
   int y;
-  int halfheight = (height + 1) >> 1;
+  int halfheight;
   void (*CopyRow)(const uint8* src, uint8* dst, int width) = CopyRow_C;
   void (*YUY2ToUV422Row)(const uint8* src_yuy2, uint8* dst_u, uint8* dst_v,
       int pix) = YUY2ToUV422Row_C;