scsi: sg: fix SG_DXFER_FROM_DEV transfers
SG_DXFER_FROM_DEV transfers do not necessarily have a dxferp as we set it to NULL for the old sg_io read/write interface, but must have a length bigger than 0. This fixes a regression introduced by commit 28676d86 ("scsi: sg: check for valid direction before starting the request") Signed-off-by: NJohannes Thumshirn <jthumshirn@suse.de> Fixes: 28676d86 ("scsi: sg: check for valid direction before starting the request") Reported-by: NChris Clayton <chris2553@googlemail.com> Tested-by: NChris Clayton <chris2553@googlemail.com> Cc: Douglas Gilbert <dgilbert@interlog.com> Reviewed-by: NHannes Reinecke <hare@suse.com> Tested-by: NChris Clayton <chris2553@googlemail.com> Acked-by: NDouglas Gilbert <dgilbert@interlog.com> Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>
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