Merge a local fix to OpenBSM's libauditd to avoid a directory descriptor

leak when iterating over possible audit trail directories.  This fix will
be merged upstream in an identical form, but hasn't yet appeared in an
OpenBSM release.

Submitted by:	guido
Obtained from:	TrustedBSD Project
MFC after:	3 days

contrib/openbsm/libauditd/auditd_lib.c

@@ -520,6 +520,7 @@ auditd_expire_trails(int (*warn_expired)(char *))
 				}
 
 		}
+		closedir(dirp);
 	}
 
 	oldest_time = current_time - expire_age;