PFSTATE_NOSYNC goes onto state_flags, not sync_state;

this prevents: panic: pfsync_delete_state: unexpected sync state 8

Reviewed by:		kp
Approved by:		re (gjb)
MFC after:		2 weeks
Sponsored by:		The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D6942

sys/netpfil/pf/pf_ioctl.c

@@ -3362,7 +3362,7 @@ pf_clear_states(void)
 		LIST_FOREACH(s, &ih->states, entry) {
 			s->timeout = PFTM_PURGE;
 			/* Don't send out individual delete messages. */
-			s->sync_state = PFSTATE_NOSYNC;
+			s->state_flags |= PFSTATE_NOSYNC;
 			pf_unlink_state(s, PF_ENTER_LOCKED);
 			goto relock;
 		}