scsi: qla2xxx: Remove free_sg command flag

The use of the free_sg command flag was dropped in commit 2c39b5ca
("qla2xxx: Remove SRR code"). Hence remove this flag and its check.

Link: https://lore.kernel.org/r/AS8PR10MB4952747D20B76DC8FE793CCA9DEE9@AS8PR10MB4952.EURPRD10.PROD.OUTLOOK.COM


Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Gleb Chesnokov <Chesnokov.G@raidix.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>