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