"NULL !=" = NULL

R=reed@google.com

Author: bsalomon@google.com

Review URL: https://codereview.chromium.org/544233002
diff --git a/src/core/SkMaskGamma.h b/src/core/SkMaskGamma.h
index 08ed97f..fb67c1a 100644
--- a/src/core/SkMaskGamma.h
+++ b/src/core/SkMaskGamma.h
@@ -194,9 +194,7 @@
     ~SkTMaskPreBlend() { }
 
     /** True if this PreBlend should be applied. When false, fR, fG, and fB are NULL. */
-    bool isApplicable() const {
-        return NULL != this->fG;
-    }
+    bool isApplicable() const { return SkToBool(this->fG); }
 
     const uint8_t* fR;
     const uint8_t* fG;