Don't call toString() eagerly on arguments to format()

Author: Shredder121

src/main/java/net/dv8tion/jda/core/utils/PermissionUtil.java

@@ -643,6 +643,6 @@ private static long apply(long permission, long allow, long deny)
     private static void checkGuild(Guild o1, Guild o2, String name)
     {
         Checks.check(o1.equals(o2),
-            "Specified %s is not in the same guild! (%s / %s)", name, o1.toString(), o2.toString());
+            "Specified %s is not in the same guild! (%s / %s)", name, o1, o2);
     }
 }