sctp: Fix double-free introduced by bad backport in 2.6.32.62

One deletion was omitted from the backport of upstream commit c485658b
("net: sctp: fix skb leakage in COOKIE ECHO path of chunk->auth_chunk").
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Willy Tarreau <w@1wt.eu>

net/sctp/sm_statefuns.c

@@ -750,7 +750,6 @@ sctp_disposition_t sctp_sf_do_5_1D_ce(const struct sctp_endpoint *ep,
 
 		/* Make sure that we and the peer are AUTH capable */
 		if (!sctp_auth_enable || !new_asoc->peer.auth_capable) {
-			kfree_skb(chunk->auth_chunk);
 			sctp_association_free(new_asoc);
 			return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
 		}