fix clang compilation warning

Submitted on behalf of Guanqun.Lu@gmail.com

Review URL: http://codereview.appspot.com/5833045/


git-svn-id: http://skia.googlecode.com/svn/trunk@3472 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/GrDrawState.h b/src/gpu/GrDrawState.h
index 7350f0f..c0ff42f 100644
--- a/src/gpu/GrDrawState.h
+++ b/src/gpu/GrDrawState.h
@@ -86,8 +86,8 @@
         GrAssert(kMemsetSize +  sizeof(fColor) + sizeof(fCoverage) +
                  sizeof(fFirstCoverageStage) + sizeof(fColorFilterMode) +
                  sizeof(fSrcBlend) + sizeof(fDstBlend) + sizeof(GrMatrix) ==
-                 reinterpret_cast<intptr_t>(&fEdgeAANumEdges) -
-                 reinterpret_cast<intptr_t>(this));
+                 reinterpret_cast<uintptr_t>(&fEdgeAANumEdges) -
+                 reinterpret_cast<uintptr_t>(this));
 
         fEdgeAANumEdges = 0;
     }