SUNRPC: drop stale comment in svc_setup_socket()

The svc_setup_socket() function does set the send and receive buffer
sizes, so the comment is out-of-date:
Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>

net/sunrpc/svcsock.c

@@ -1367,7 +1367,6 @@ EXPORT_SYMBOL_GPL(svc_sock_update_bufs);
 
 /*
  * Initialize socket for RPC use and create svc_sock struct
- * XXX: May want to setsockopt SO_SNDBUF and SO_RCVBUF.
  */
 static struct svc_sock *svc_setup_socket(struct svc_serv *serv,
 						struct socket *sock,