"NULL !=" = NULL

R=reed@google.com

Author: bsalomon@google.com

Review URL: https://codereview.chromium.org/544233002
diff --git a/src/gpu/SkGrPixelRef.cpp b/src/gpu/SkGrPixelRef.cpp
index f56c3b6..d5be965 100644
--- a/src/gpu/SkGrPixelRef.cpp
+++ b/src/gpu/SkGrPixelRef.cpp
@@ -125,7 +125,7 @@
     if (fUnlock) {
         GrContext* context = fSurface->getContext();
         GrTexture* texture = fSurface->asTexture();
-        if (NULL != context && NULL != texture) {
+        if (context && texture) {
             context->unlockScratchTexture(texture);
         }
     }
@@ -133,7 +133,7 @@
 }
 
 GrTexture* SkGrPixelRef::getTexture() {
-    if (NULL != fSurface) {
+    if (fSurface) {
         return fSurface->asTexture();
     }
     return NULL;
@@ -159,7 +159,7 @@
     }
 
     int left, top, width, height;
-    if (NULL != subset) {
+    if (subset) {
         left = subset->fLeft;
         width = subset->width();
         top = subset->fTop;