sctp: fix ignoring asoc_id for tcp-style sockets on SCTP_AUTH_ACTIVE_KEY sockopt

A similar fix as Patch "sctp: fix ignoring asoc_id for tcp-style sockets on
SCTP_DEFAULT_SEND_PARAM sockopt" on SCTP_AUTH_ACTIVE_KEY sockopt.

Fixes: bf9fb6ad4f29 ("sctp: use SCTP_FUTURE_ASSOC and add SCTP_CURRENT_ASSOC for SCTP_AUTH_ACTIVE_KEY sockopt")
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 2ac221c..1d098f0 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -3871,6 +3871,9 @@
 	if (asoc)
 		return sctp_auth_set_active_key(ep, asoc, val.scact_keynumber);
 
+	if (sctp_style(sk, TCP))
+		val.scact_assoc_id = SCTP_FUTURE_ASSOC;
+
 	if (val.scact_assoc_id == SCTP_FUTURE_ASSOC ||
 	    val.scact_assoc_id == SCTP_ALL_ASSOC) {
 		ret = sctp_auth_set_active_key(ep, asoc, val.scact_keynumber);