vxlan_core: delete unnecessary condition

The previous check handled the "if (!nh)" condition so we know "nh"
is non-NULL here.  Delete the check and pull the code in one tab.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Nikolay Aleksandrov <razor@blackwall.org>
Reviewed-by: Roopa Prabhu <roopa@nvidia.com>
Link: https://lore.kernel.org/r/20220307125735.GC16710@kiliSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/vxlan/vxlan_core.c

@@ -811,7 +811,6 @@ static int vxlan_fdb_nh_update(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
 		goto err_inval;
 	}
 
-	if (nh) {
 	if (!nexthop_get(nh)) {
 		NL_SET_ERR_MSG(extack, "Nexthop has been deleted");
 		nh = NULL;
@@ -843,7 +842,6 @@ static int vxlan_fdb_nh_update(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
 			goto err_inval;
 		}
 	}
-	}
 
 	if (old_nh) {
 		list_del_rcu(&fdb->nh_list);