[NET]: Convert init_timer into setup_timer

Many-many code in the kernel initialized the timer->function
and  timer->data together with calling init_timer(timer). There
is already a helper for this. Use it for networking code.

The patch is HUGE, but makes the code 130 lines shorter
(98 insertions(+), 228 deletions(-)).

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/x25/x25_link.c

@@ -247,10 +247,7 @@ void x25_link_device_up(struct net_device *dev)
 		return;
 
 	skb_queue_head_init(&nb->queue);
-
-	init_timer(&nb->t20timer);
-	nb->t20timer.data     = (unsigned long)nb;
-	nb->t20timer.function = &x25_t20timer_expiry;
+	setup_timer(&nb->t20timer, x25_t20timer_expiry, (unsigned long)nb);
 
 	dev_hold(dev);
 	nb->dev      = dev;