Apply suggestion from @maje-emb

Co-authored-by: Marcin Jeliński <81804485+maje-emb@users.noreply.github.com>

Author: ahasztag

subsys/bluetooth/services/hogp.c

@@ -1077,7 +1077,7 @@ int bt_hogp_rep_subscribe(struct bt_hogp *hogp,
 int bt_hogp_rep_unsubscribe(struct bt_hogp *hogp,
 			    struct bt_hogp_rep_info *rep)
 {
-	int ret = 0;
+	int ret;
 
 	if (!hogp || !rep) {
 		return -EINVAL;