skbuff: kill skb_flow_get_ports()

Since commit a815bde56b15 ("net, bonding: Refactor bond_xmit_hash for use
with xdp_buff"), this function is not used anymore.

Signed-off-by: Nicolas Dichtel <[e-mail]>
Reviewed-by: Simon Horman <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

include/linux/skbuff.h

···
 __be32 __skb_flow_get_ports(const struct sk_buff *skb, int thoff, u8 ip_proto,
 			    const void *data, int hlen_proto);
 
-static inline __be32 skb_flow_get_ports(const struct sk_buff *skb,
-					int thoff, u8 ip_proto)
-{
-	return __skb_flow_get_ports(skb, thoff, ip_proto, NULL, 0);
-}
-
 void skb_flow_dissector_init(struct flow_dissector *flow_dissector,
 			     const struct flow_dissector_key *key,
 			     unsigned int key_count);