net: dsa: remove "inline" from dsa_user_netpoll_send_skb()

The convention is to not use "inline" functions in C files, and let the
compiler decide whether to inline or not.
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://lore.kernel.org/r/20240206112927.4134375-1-vladimir.oltean@nxp.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

net/dsa/user.c

@@ -875,8 +875,8 @@ static int dsa_user_port_obj_del(struct net_device *dev, const void *ctx,
 	return err;
 }
 
-static inline netdev_tx_t dsa_user_netpoll_send_skb(struct net_device *dev,
-						    struct sk_buff *skb)
+static netdev_tx_t dsa_user_netpoll_send_skb(struct net_device *dev,
+					     struct sk_buff *skb)
 {
 #ifdef CONFIG_NET_POLL_CONTROLLER
 	struct dsa_user_priv *p = netdev_priv(dev);