If we have a negative current message, we shouldn't go back even further...

Issue 9727.


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.2@64758 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/app_voicemail.c

@@ -5427,7 +5427,7 @@ static int vm_execmain(struct ast_channel *chan, void *data)
 			}
 			break;
 		case '4':
-			if (vms.curmsg) {
+			if (vms.curmsg > 0) {
 				vms.curmsg--;
 				cmd = play_message(chan, vmu, &vms);
 			} else {