netfilter: xt_rateest: fix xt_rateest_mt_checkentry()

commit 4a5a5c73b7cfee (slightly better error reporting) added some
useless code in xt_rateest_mt_checkentry().

Fix this so that different error codes can really be returned.

Signed-off-by: Eric Dumazet <[e-mail]>
CC: Jan Engelhardt <[e-mail]>
Signed-off-by: Patrick McHardy <[e-mail]>

net/netfilter/xt_rateest.c

···
 {
 	struct xt_rateest_match_info *info = par->matchinfo;
 	struct xt_rateest *est1, *est2;
-	int ret = false;
+	int ret = -EINVAL;
 
 	if (hweight32(info->flags & (XT_RATEEST_MATCH_ABS |
 				     XT_RATEEST_MATCH_REL)) != 1)
···
 	if (!est1)
 		goto err1;
 
+	est2 = NULL;
 	if (info->flags & XT_RATEEST_MATCH_REL) {
 		est2 = xt_rateest_lookup(info->name2);
 		if (!est2)
 			goto err2;
-	} else
-		est2 = NULL;
-
+	}
 
 	info->est1 = est1;
 	info->est2 = est2;
···
 err2:
 	xt_rateest_put(est1);
 err1:
-	return -EINVAL;
+	return ret;
 }
 
 static void xt_rateest_mt_destroy(const struct xt_mtdtor_param *par)