Use sbsndptr_adv() instead of sbsndptr() for TOE TLS.

For TOE TLS, we just want to advance the send pointer to skip over the
record just sent to the TOE.  The recently added sbsndptr_adv() is
sufficient for that and is cheaper.

MFC after:	1 month
Sponsored by:	Chelsio Communications

sys/dev/cxgbe/tom/t4_tls.c

@@ -1368,7 +1368,7 @@ t4_push_tls_records(struct adapter *sc, struct toepcb *toep, int drop)
 		tp->snd_max += plen;
 
 		SOCKBUF_LOCK(sb);
-		sbsndptr(sb, tls_ofld->sb_off, plen, &sndptroff);
+		sbsndptr_adv(sb, sb->sb_sndptr, plen);
 		tls_ofld->sb_off += plen;
 		SOCKBUF_UNLOCK(sb);