"NULL !=" = NULL

R=reed@google.com

Author: bsalomon@google.com

Review URL: https://codereview.chromium.org/544233002
diff --git a/src/images/SkImageDecoder_libpng.cpp b/src/images/SkImageDecoder_libpng.cpp
index b69f879..dd1d1c8 100644
--- a/src/images/SkImageDecoder_libpng.cpp
+++ b/src/images/SkImageDecoder_libpng.cpp
@@ -62,7 +62,7 @@
         stream->ref();
     }
     ~SkPNGImageIndex() {
-        if (NULL != fPng_ptr) {
+        if (fPng_ptr) {
             png_destroy_read_struct(&fPng_ptr, &fInfo_ptr, png_infopp_NULL);
         }
     }
@@ -1161,7 +1161,7 @@
 
     // we must do this after we have locked the pixels
     SkColorTable* ctable = bitmap.getColorTable();
-    if (NULL != ctable) {
+    if (ctable) {
         if (ctable->count() == 0) {
             return false;
         }