tcp: remove obsoleted comment about different passes

This is obsolete since the passes got combined.

Signed-off-by: Ilpo Järvinen <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

net/ipv4/tcp_output.c

···
 		last_lost = tp->snd_una;
 	}
 
-	/* First pass: retransmit lost packets. */
 	tcp_for_write_queue_from(skb, sk) {
 		__u8 sacked = TCP_SKB_CB(skb)->sacked;