scsi: qla2xxx: Fix return of uninitialized value in rval

A previous change removed the initialization of rval and there is now an
error where an uninitialized rval is being returned on an error return
path. Fix this by returning -ENODEV.

Link: https://lore.kernel.org/r/20201008183239.200358-1-colin.king@canonical.com
Fixes: b994718 ("scsi: qla2xxx: Use constant when it is known")
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Acked-by: Pavel Machek (CIP) <pavel@denx.de>
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Addresses-Coverity: ("Uninitialized scalar variable")

Author: Colin Ian King

drivers/scsi/qla2xxx/qla_nvme.c

@@ -562,7 +562,7 @@ static int qla_nvme_post_cmd(struct nvme_fc_local_port *lport,
 	vha = fcport->vha;
 
 	if (!(fcport->nvme_flag & NVME_FLAG_REGISTERED))
-		return rval;
+		return -ENODEV;
 
 	if (test_bit(ABORT_ISP_ACTIVE, &vha->dpc_flags) ||
 	    (qpair && !qpair->fw_started) || fcport->deleted)