tweak to mod_limit for the db_function used in the dialplan

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@10175 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/mod/applications/mod_limit/mod_limit.c

@@ -375,7 +375,7 @@ SWITCH_STANDARD_APP(db_function)
 		argc = switch_separate_string(mydata, '/', argv, (sizeof(argv) / sizeof(argv[0])));
 	}
 
-	if (argc < 4 || !argv[0]) {
+	if (argc < 3 || !argv[0]) {
 		goto error;
 	}