followup cleanup for blur and make compilable with /clr
BUG=none
TEST=none
Review URL: https://webrtc-codereview.appspot.com/645007

git-svn-id: http://libyuv.googlecode.com/svn/trunk@284 16f28f9a-4ce2-e073-06de-1de4eb20be90
diff --git a/source/row_posix.cc b/source/row_posix.cc
index 0fdb092..c111f60 100644
--- a/source/row_posix.cc
+++ b/source/row_posix.cc
@@ -2936,7 +2936,7 @@
 // Creates a table of cumulative sums where each value is a sum of all values
 // above and to the left of the value, inclusive of the value.
 void ComputeCumulativeSumRow_SSE2(const uint8* row, int32* cumsum,
-                                  int32* previous_cumsum, int width) {
+                                  const int32* previous_cumsum, int width) {
   asm volatile (
     "sub       %1,%2                           \n"
     "pxor      %%xmm0,%%xmm0                   \n"