mka: Avoid inconsistent state in ieee802_1x_kay_move_live_peer()

If the memory allocation in ieee802_1x_kay_init_receive_sc() fails, we
end up in an inconsistent state where the peer is moved to the live
peers list and its sci is setup, but we don't have an rxsc.

Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>

src/pae/ieee802_1x_kay.c

@@ -604,6 +604,11 @@ ieee802_1x_kay_move_live_peer(struct ieee802_1x_mka_participant *participant,
 			break;
 	}
 
+	rxsc = ieee802_1x_kay_init_receive_sc(&participant->current_peer_sci,
+					      sc_ch);
+	if (!rxsc)
+		return NULL;
+
 	os_memcpy(&peer->sci, &participant->current_peer_sci,
 		  sizeof(peer->sci));
 	peer->mn = mn;
@@ -620,10 +625,6 @@ ieee802_1x_kay_move_live_peer(struct ieee802_1x_mka_participant *participant,
 
 	secy_get_available_receive_sc(participant->kay, &sc_ch);
 
-	rxsc = ieee802_1x_kay_init_receive_sc(&peer->sci, sc_ch);
-	if (!rxsc)
-		return NULL;
-
 	dl_list_add(&participant->rxsc_list, &rxsc->list);
 	secy_create_receive_sc(participant->kay, rxsc);