netfilter: ebtables: do centralized size checking

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
Signed-off-by: Patrick McHardy <kaber@trash.net>
diff --git a/net/bridge/netfilter/ebt_among.c b/net/bridge/netfilter/ebt_among.c
index 70b6dca..b0acb13 100644
--- a/net/bridge/netfilter/ebt_among.c
+++ b/net/bridge/netfilter/ebt_among.c
@@ -216,6 +216,7 @@
 	.name		= EBT_AMONG_MATCH,
 	.match		= ebt_filter_among,
 	.check		= ebt_among_check,
+	.matchsize	= -1, /* special case */
 	.me		= THIS_MODULE,
 };