Asterisk 18103 - Fix reload crash caused by destroying default parking lot

Default parking lot was being destroyed in reload and was not being rebuilt properly.
This patch keeps features.c reload from destroying the default parking lot in 1.6.2.
Bug was caused by a hasty backport which didn't test reload enough times to catch the
problem.

(closes issue ASTERISK-18103)
Reported by: 808blogger

Review: https://reviewboard.asterisk.org/r/1337/


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.6.2@330490 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/features.c

@@ -4251,8 +4251,10 @@ static int load_config(void)
 		struct ast_parkinglot *p;
 		struct ao2_iterator iter = ao2_iterator_init(parkinglots, 0);
 		while ((p = ao2_iterator_next(&iter))) {
-			ao2_unlink(parkinglots, p);
-			ao2_ref(p,-1);
+			if (p != default_parkinglot) {
+				ao2_unlink(parkinglots, p);
+				ao2_ref(p,-1);
+			}
 		}
 		ao2_iterator_destroy(&iter);
 	}