set gfn=* does not set p_guifont to "*" (fix mostly in Vim code)

git-svn-id: http://macvim.googlecode.com/svn/trunk@271 96c4425d-ca35-0410-94e5-3396d5c13a8f

MMBackend.m

@@ -779,7 +779,7 @@ enum {
         if ([fontName isEqual:@"*"]) {
             // :set gfn=* shows the font panel.
             do_cmdline_cmd((char_u*)":action orderFrontFontPanel:");
-            return YES;
+            return NO;
         }
 
         NSArray *components = [fontName componentsSeparatedByString:@":"];