sja1000: don't use [delayed_]work_pending()

There's no need to test whether a (delayed) work item in pending
before queueing, flushing or cancelling it.  Most uses are unnecessary
and quite a few of them are buggy.

Remove unnecessary pending tests from sja1000.  Only compile tested.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: "David S. Miller" <davem@davemloft.net>
Cc: Wolfgang Grandegger <wg@grandegger.com>
Cc: netdev@vger.kernel.org

drivers/net/can/sja1000/peak_pci.c

@@ -339,7 +339,6 @@ static void peak_pciec_set_leds(struct peak_pciec_card *card, u8 led_mask, u8 s)
  */
 static void peak_pciec_start_led_work(struct peak_pciec_card *card)
 {
-	if (!delayed_work_pending(&card->led_work))
 	schedule_delayed_work(&card->led_work, HZ);
 }