BUG/MINOR: lua: bad return code

If the lua/cli fails during initialization, it returns an ok
status, an the execution continue. This will probably occur a
segfault.

Thiw patch should be backported in 1.7
diff --git a/src/hlua.c b/src/hlua.c
index 28ddf44..326f723 100644
--- a/src/hlua.c
+++ b/src/hlua.c
@@ -6677,7 +6677,7 @@
 	appctx->ctx.hlua_cli.task = task_new();
 	if (!appctx->ctx.hlua_cli.task) {
 		SEND_ERR(NULL, "Lua cli '%s': out of memory.\n", fcn->name);
-		return 0;
+		return 1;
 	}
 	appctx->ctx.hlua_cli.task->nice = 0;
 	appctx->ctx.hlua_cli.task->context = appctx;