correct sense of logic test (issue #5259)

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@6650 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/app_chanisavail.c

@@ -135,7 +135,7 @@ static int chanavail_exec(struct ast_channel *chan, void *data)
 	if (res < 1) {
 		pbx_builtin_setvar_helper(chan, "AVAILCHAN", "");
 		pbx_builtin_setvar_helper(chan, "AVAILORIGCHAN", "");
-		if (!ast_goto_if_exists(chan, chan->context, chan->exten, chan->priority + 101))
+		if (ast_goto_if_exists(chan, chan->context, chan->exten, chan->priority + 101))
 			return -1;
 	}