net/lapb: re-send packets on timeout

Actually re-send packets when the T1 timer runs out. This fixes a bug
where packets are waiting on the write queue until disconnection when
no other traffic is outstanding.

Signed-off-by: Josselin Costanzi <[e-mail]>
Signed-off-by: Maxime Jayat <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

net/lapb/lapb_timer.c

···
 			} else {
 				lapb->n2count++;
 				lapb_requeue_frames(lapb);
+				lapb_kick(lapb);
 			}
 			break;