ARM: ecard: get rid of NO_IRQ madness

Get rid of the NO_IRQ madness from Acorn expansion card handling code.
Thankfully, are relatively few users of this here, and so it's easy to
audit.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/drivers/scsi/arm/fas216.c b/drivers/scsi/arm/fas216.c
index e85c40b..6206a66 100644
--- a/drivers/scsi/arm/fas216.c
+++ b/drivers/scsi/arm/fas216.c
@@ -2176,7 +2176,7 @@
 	fn = (void (*)(FAS216_Info *, struct scsi_cmnd *, unsigned int))SCpnt->host_scribble;
 	fn(info, SCpnt, result);
 
-	if (info->scsi.irq != NO_IRQ) {
+	if (info->scsi.irq) {
 		spin_lock_irqsave(&info->host_lock, flags);
 		if (info->scsi.phase == PHASE_IDLE)
 			fas216_kick(info);
@@ -2276,7 +2276,7 @@
 	 * We should only be using this if we don't have an interrupt.
 	 * Provide some "incentive" to use the queueing code.
 	 */
-	BUG_ON(info->scsi.irq != NO_IRQ);
+	BUG_ON(info->scsi.irq);
 
 	info->internal_done = 0;
 	fas216_queue_command_lck(SCpnt, fas216_internal_done);