Linux: Fix some NULL versus 0 issues to appease gcc-4.5.

webkit/glue/plugins/pepper_image_data.cc

Index: webkit/glue/plugins/pepper_image_data.cc
diff --git a/webkit/glue/plugins/pepper_image_data.cc b/webkit/glue/plugins/pepper_image_data.cc
index 8288fe2d63223e02006c7c82021aa83ee6b611c1..d3246c284f374f881bfd9c7eae60d4998ef024a2 100644
--- a/webkit/glue/plugins/pepper_image_data.cc
+++ b/webkit/glue/plugins/pepper_image_data.cc
@@ -31,11 +31,11 @@ PP_Resource Create(PP_Module module_id,
                    bool init_to_zero) {
   PluginModule* module = PluginModule::FromPPModule(module_id);
   if (!module)
-    return NULL;
+    return 0;
 
   scoped_refptr<ImageData> data(new ImageData(module));
   if (!data->Init(format, size->width, size->height, init_to_zero))
-    return NULL;
+    return 0;
 
   return data->GetReference();
 }