don't use NULL when comparing against ints/size_t (fixes warning)



git-svn-id: http://skia.googlecode.com/svn/trunk@7512 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/GrDrawTarget.cpp b/src/gpu/GrDrawTarget.cpp
index bb8b9ec..2cbcf19 100644
--- a/src/gpu/GrDrawTarget.cpp
+++ b/src/gpu/GrDrawTarget.cpp
@@ -703,7 +703,7 @@
 
     for (int i = 0; i < GrDrawState::kNumStages; ++i) {
         if (explicitCoordMask & (1 << i)) {
-            GrAssert(NULL != stageOffsets[i]);
+            GrAssert(0 != stageOffsets[i]);
             GrPoint* coords = GrTCast<GrPoint*>(GrTCast<intptr_t>(geo.vertices()) +
                                                 stageOffsets[i]);
             coords->setRectFan(srcRects[i]->fLeft, srcRects[i]->fTop,
@@ -713,7 +713,7 @@
                 srcMatrices[i]->mapPointsWithStride(coords, vsize, 4);
             }
         } else {
-            GrAssert(NULL == stageOffsets[i]);
+            GrAssert(0 == stageOffsets[i]);
         }
     }