scsi: fdomain: Fix error return code in fdomain_probe()

If request_region() fails the return value is not set. Return -EBUSY on
error.

Link: https://lore.kernel.org/r/[e-mail]
Fixes: 8674a8aa2c39 ("scsi: fdomain: Add PCMCIA support")
Reported-by: Hulk Robot <[e-mail]>
Signed-off-by: Wei Li <[e-mail]>
Signed-off-by: Martin K. Petersen <[e-mail]>

drivers/scsi/pcmcia/fdomain_cs.c

···
 		goto fail_disable;
 
 	if (!request_region(link->resource[0]->start, FDOMAIN_REGION_SIZE,
-			    "fdomain_cs"))
+			    "fdomain_cs")) {
+		ret = -EBUSY;
 		goto fail_disable;
+	}
 
 	sh = fdomain_create(link->resource[0]->start, link->irq, 7, &link->dev);
 	if (!sh) {