dynamic_pin can be NULL (bug #2202)

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@3570 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/app_meetme.c

@@ -1082,7 +1082,7 @@ static struct ast_conference *find_conf(struct ast_channel *chan, char *confno,
 			}
 			ast_destroy(cfg);
 		}
-	} else {
+	} else if (dynamic_pin) {
 		/* Correct for the user selecting 'D' instead of 'd' to have
 		   someone join into a conference that has already been created
 		   with a pin. */