[SCTP]: Fix getsockname for sctp when an ipv6 socket accepts a connection from an ipv4 socket.

Signed-off-by: Neil Horman <[e-mail]>
Signed-off-by: Sridhar Samudrala <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

net/sctp/transport.c

···
 		 * association's active path for getsockname().
 		 */ 
 		if (asoc && (transport == asoc->peer.active_path))
-			af->to_sk_saddr(&transport->saddr, asoc->base.sk);
+			opt->pf->af->to_sk_saddr(&transport->saddr,
+						 asoc->base.sk);
 	} else
 		transport->pmtu = SCTP_DEFAULT_MAXSEGMENT;
 }