CLEANUP: hlua: Remove dead-code on error path in hlua_socket_new()

Since last fixes about the lua cosocket, the appctx is no longer initialized
in hlua_socket_new(). The code to deal with error at this stage can be
removed.

This patch should fix the issue #2308.

src/hlua.c

@@ -3396,8 +3396,6 @@ __LJMP static int hlua_socket_new(lua_State *L)
 	xref_create(&socket->xref, &ctx->xref);
 	return 1;
 
- out_fail_appctx:
-	appctx_free_on_early_error(appctx);
  out_fail_conf:
 	WILL_LJMP(lua_error(L));
 	return 0;