zorro: ZTWO_VADDR() should return "void __iomem *"

ZTWO_VADDR() converts from physical to virtual I/O addresses, so it should
return "void __iomem *" instead of "unsigned long".

This allows to drop several casts, but requires adding a few casts to
accomodate legacy driver frameworks that store "unsigned long" I/O
addresses.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
diff --git a/drivers/scsi/a4000t.c b/drivers/scsi/a4000t.c
index 70c521f..f5a2ab4 100644
--- a/drivers/scsi/a4000t.c
+++ b/drivers/scsi/a4000t.c
@@ -56,7 +56,7 @@
 	scsi_addr = res->start + A4000T_SCSI_OFFSET;
 
 	/* Fill in the required pieces of hostdata */
-	hostdata->base = (void __iomem *)ZTWO_VADDR(scsi_addr);
+	hostdata->base = ZTWO_VADDR(scsi_addr);
 	hostdata->clock = 50;
 	hostdata->chip710 = 1;
 	hostdata->dmode_extra = DMODE_FC2;