[master] race condition when reloading while resigning

4661.	[bug]		A race condition could occur if a zone was reloaded
			while resigning, triggering a crash in
			rbtdb.c:closeversion(). [RT #45276]

CHANGES

+4661.	[bug]		A race condition could occur if a zone was reloaded
+			while resigning, triggering a crash in
+			rbtdb.c:closeversion(). [RT #45276]
+
 4660.	[bug]		Remove spurious "peer" from Windows socket log
 			messages. [RT #45617]
 

lib/dns/zone.c

@@ -6438,7 +6438,7 @@ zone_resigninc(dns_zone_t *zone) {
 	for (i = 0; i < nkeys; i++)
 		dst_key_free(&zone_keys[i]);
 	if (version != NULL) {
-		dns_db_closeversion(zone->db, &version, ISC_FALSE);
+		dns_db_closeversion(db, &version, ISC_FALSE);
 		dns_db_detach(&db);
 	} else if (db != NULL)
 		dns_db_detach(&db);