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

webkit/glue/plugins/pepper_font.cc

Index: webkit/glue/plugins/pepper_font.cc
diff --git a/webkit/glue/plugins/pepper_font.cc b/webkit/glue/plugins/pepper_font.cc
index af4cb81ddcce3f9e88081f6a651ef496531c576a..378842a7dcd2f019bb3475637642d66e5e929ddc 100644
--- a/webkit/glue/plugins/pepper_font.cc
+++ b/webkit/glue/plugins/pepper_font.cc
@@ -24,14 +24,14 @@ PP_Resource MatchFontWithFallback(PP_Module module_id,
 #if defined(OS_LINUX)
   PluginModule* module = PluginModule::FromPPModule(module_id);
   if (!module)
-    return NULL;
+    return 0;
 
   int fd = webkit_glue::MatchFontWithFallback(description->face,
                                               description->weight >= 700,
                                               description->italic,
                                               description->charset);
   if (fd == -1)
-    return NULL;
+    return 0;
 
   scoped_refptr<Font> font(new Font(module, fd));