fix bug in GrGLInterface validation added in r4192


git-svn-id: http://skia.googlecode.com/svn/trunk@4193 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/gl/GrGLInterface.cpp b/src/gpu/gl/GrGLInterface.cpp
index 34d6a74..140b5fd 100644
--- a/src/gpu/gl/GrGLInterface.cpp
+++ b/src/gpu/gl/GrGLInterface.cpp
@@ -196,9 +196,9 @@
         // GL_NV_path_rendering. We're not enforcing that they be non-NULL
         // because they aren't actually called at this time.
         if (false &&
-            NULL == fMatrixMode ||
-            NULL == fLoadIdentity ||
-            NULL == fLoadMatrixf) {
+            (NULL == fMatrixMode ||
+             NULL == fLoadIdentity ||
+             NULL == fLoadMatrixf)) {
             return false;
         }
         if (false && GrGLHasExtensionFromString("GL_NV_path_rendering", ext)) {