scsi: qla2xxx: Return appropriate failure through BSG Interface

This patch ensures flash updates API calls return possible failure
status through BSG interface to the application.

Link: https://lore.kernel.org/r/20200226224022.24518-7-hmadhani@marvell.com


Signed-off-by: Himanshu Madhani <hmadhani@marvell.com>
Signed-off-by: Michael Hernandez <mhernandez@marvell.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>