cxgbe(4): Tidy up t4_l2t.h

Align the comment for if_t with the rest and remove the declaration of
t4_l2t_set_switching, which was removed in 061bbaf.

No functional change.

MFC after:	3 days
Sponsored by:	Chelsio Communications

sys/dev/cxgbe/t4_l2t.h

@@ -64,7 +64,7 @@ struct l2t_entry {
 	uint32_t addr[4];		/* next hop IP or IPv6 address */
 	uint32_t iqid;			/* iqid for reply to write_l2e */
 	struct sge_wrq *wrq;		/* queue to use for write_l2e */
-	if_t ifp;		/* outgoing interface */
+	if_t ifp;			/* outgoing interface */
 	uint16_t smt_idx;		/* SMT index */
 	uint16_t vlan;			/* VLAN TCI (id: 0-11, prio: 13-15) */
 	struct l2t_entry *first;	/* start of hash chain */
@@ -94,8 +94,6 @@ struct l2t_entry *t4_l2t_alloc_switching(struct adapter *, uint16_t, uint8_t,
     uint8_t *);
 struct l2t_entry *t4_l2t_alloc_tls(struct adapter *, struct sge_txq *,
     void *, int *, uint16_t, uint8_t, uint8_t *);
-int t4_l2t_set_switching(struct adapter *, struct l2t_entry *, uint16_t,
-    uint8_t, uint8_t *);
 int t4_write_l2e(struct l2t_entry *, int);
 int do_l2t_write_rpl(struct sge_iq *, const struct rss_header *, struct mbuf *);