batman-adv: return proper value in case of hash_add failure

In case of hash_add failure tt_global_add() must return 0 (which means on entry
insertion).
Signed-off-by: Antonio Quartulli <ordex@autistici.org>

net/batman-adv/translation-table.c

@@ -776,13 +776,13 @@ int batadv_tt_global_add(struct batadv_priv *bat_priv,
 	batadv_dbg(BATADV_DBG_TT, bat_priv,
 		   "Creating new global tt entry: %pM (via %pM)\n",
 		   tt_global_entry->common.addr, orig_node->orig);
+	ret = 1;
 
 out_remove:
 	/* remove address from local hash if present */
 	batadv_tt_local_remove(bat_priv, tt_global_entry->common.addr,
 			       "global tt received",
 			       flags & BATADV_TT_CLIENT_ROAM);
-	ret = 1;
 out:
 	if (tt_global_entry)
 		batadv_tt_global_entry_free_ref(tt_global_entry);