quick fix for sobel compile error
BUG=201
TESTED=out\release\libyuv_unittest --gtest_filter=*Sobel*
Review URL: https://webrtc-codereview.appspot.com/1226004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@615 16f28f9a-4ce2-e073-06de-1de4eb20be90
diff --git a/source/row_posix.cc b/source/row_posix.cc
index 34b24c5..471f945 100644
--- a/source/row_posix.cc
+++ b/source/row_posix.cc
@@ -4599,7 +4599,7 @@
     "lea       0x20(%0),%0                     \n"
     "pshufb    %%xmm5,%%xmm0                   \n"
     "pshufb    %%xmm5,%%xmm1                   \n"
-    "punpckldq xmm1, xmm0                      \n"
+    "punpckldq %%xmm1,%%xmm0                   \n"
     "sub       $0x8,%2                         \n"
     "movq      %%xmm0,(%1)                     \n"
     "lea       0x8(%1),%1                      \n"