"NULL !=" = NULL

R=reed@google.com

Author: bsalomon@google.com

Review URL: https://codereview.chromium.org/544233002
diff --git a/src/image/SkSurface_Raster.cpp b/src/image/SkSurface_Raster.cpp
index 167f773..13f2155 100644
--- a/src/image/SkSurface_Raster.cpp
+++ b/src/image/SkSurface_Raster.cpp
@@ -118,7 +118,7 @@
 
 void SkSurface_Raster::onCopyOnWrite(ContentChangeMode mode) {
     // are we sharing pixelrefs with the image?
-    SkASSERT(NULL != this->getCachedImage());
+    SkASSERT(this->getCachedImage());
     if (SkBitmapImageGetPixelRef(this->getCachedImage()) == fBitmap.pixelRef()) {
         SkASSERT(fWeOwnThePixels);
         if (kDiscard_ContentChangeMode == mode) {
@@ -131,7 +131,7 @@
         // Now fBitmap is a deep copy of itself (and therefore different from
         // what is being used by the image. Next we update the canvas to use
         // this as its backend, so we can't modify the image's pixels anymore.
-        SkASSERT(NULL != this->getCachedCanvas());
+        SkASSERT(this->getCachedCanvas());
         this->getCachedCanvas()->getDevice()->replaceBitmapBackendForRasterSurface(fBitmap);
     }
 }