xsk: Fold xp_assign_dev and __xp_assign_dev

Fold xp_assign_dev and __xp_assign_dev. The former directly calls the
latter.
Signed-off-by: Björn Töpel <bjorn.topel@intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Link: https://lore.kernel.org/bpf/20210122105351.11751-3-bjorn.topel@gmail.com

net/xdp/xsk_buff_pool.c

@@ -119,7 +119,7 @@ static void xp_disable_drv_zc(struct xsk_buff_pool *pool)
 	}
 }
 
-static int __xp_assign_dev(struct xsk_buff_pool *pool,
+int xp_assign_dev(struct xsk_buff_pool *pool,
 		  struct net_device *netdev, u16 queue_id, u16 flags)
 {
 	bool force_zc, force_copy;
@@ -191,12 +191,6 @@ static int __xp_assign_dev(struct xsk_buff_pool *pool,
 	return err;
 }
 
-int xp_assign_dev(struct xsk_buff_pool *pool, struct net_device *dev,
-		  u16 queue_id, u16 flags)
-{
-	return __xp_assign_dev(pool, dev, queue_id, flags);
-}
-
 int xp_assign_dev_shared(struct xsk_buff_pool *pool, struct xdp_umem *umem,
 			 struct net_device *dev, u16 queue_id)
 {
@@ -210,7 +204,7 @@ int xp_assign_dev_shared(struct xsk_buff_pool *pool, struct xdp_umem *umem,
 	if (pool->uses_need_wakeup)
 		flags |= XDP_USE_NEED_WAKEUP;
 
-	return __xp_assign_dev(pool, dev, queue_id, flags);
+	return xp_assign_dev(pool, dev, queue_id, flags);
 }
 
 void xp_clear_dev(struct xsk_buff_pool *pool)