"NULL !=" = NULL

R=reed@google.com

Author: bsalomon@google.com

Review URL: https://codereview.chromium.org/544233002
diff --git a/tools/skpdiff/skpdiff_util.cpp b/tools/skpdiff/skpdiff_util.cpp
index 4a92f5e..498f657 100644
--- a/tools/skpdiff/skpdiff_util.cpp
+++ b/tools/skpdiff/skpdiff_util.cpp
@@ -174,7 +174,7 @@
     // Note these paths are in sorted order by default according to http://linux.die.net/man/3/glob
     // Check under the flag GLOB_NOSORT
     char** paths = globBuffer.gl_pathv;
-    while(NULL != *paths) {
+    while(*paths) {
         entries->push_back(SkString(*paths));
         paths++;
     }