imm: check parport_claim

parport_claim() can fail and we should be checking if we were able to
claim the port.
Signed-off-by: Sudip Mukherjee <sudip.mukherjee@codethink.co.uk>
Reviewed-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/imm.c

@@ -77,10 +77,11 @@ static void imm_wakeup(void *ref)
 
 	spin_lock_irqsave(&arbitration_lock, flags);
 	if (dev->wanted) {
-		parport_claim(dev->dev);
+		if (parport_claim(dev->dev) == 0) {
 			got_it(dev);
 			dev->wanted = 0;
 		}
+	}
 	spin_unlock_irqrestore(&arbitration_lock, flags);
 }