[PATCH] region handling cleanup

Done by William Stinson.
Adds error handling to request_region() calls,
and converts some old check_region() calls too.

drivers/acorn/scsi/oak.c

@@ -134,7 +134,8 @@ int oakscsi_detect(Scsi_Host_Template * tpnt)
 	ecard_claim(ecs[count]);
 
 	instance->n_io_port = 255;
-	request_region (instance->io_port, instance->n_io_port, "Oak SCSI");
+	if (!request_region (instance->io_port, instance->n_io_port, "Oak SCSI"))
+		break;
 
 	if (instance->irq != IRQ_NONE)
 	    if (request_irq(instance->irq, do_oakscsi_intr, SA_INTERRUPT, "Oak SCSI", NULL)) {