m68k/mac: cleanup mac_irq_pending

mac_irq_pending() has only one caller (mac_esp.c). Nothing tests for Baboon, PSC or OSS pending interrupts. Until that need arises, let's keep it simple and remove all the unused abstraction. Replace it with a routine to check for SCSI DRQ.

Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
diff --git a/drivers/scsi/mac_esp.c b/drivers/scsi/mac_esp.c
index 590ce1e..4ceeace 100644
--- a/drivers/scsi/mac_esp.c
+++ b/drivers/scsi/mac_esp.c
@@ -25,6 +25,7 @@
 #include <asm/dma.h>
 #include <asm/macints.h>
 #include <asm/macintosh.h>
+#include <asm/mac_via.h>
 
 #include <scsi/scsi_host.h>
 
@@ -149,7 +150,7 @@
 
 	do {
 		if (mep->pdma_regs == NULL) {
-			if (mac_irq_pending(IRQ_MAC_SCSIDRQ))
+			if (via2_scsi_drq_pending())
 				return 0;
 		} else {
 			if (nubus_readl(mep->pdma_regs) & 0x200)