scsi: return EAGAIN when resetting a device under EH

Signed-off-by: Christoph Hellwig <[e-mail]>
Reviewed-by: Martin K. Petersen <[e-mail]>
Reviewed-by: Hannes Reinecke <[e-mail]>

drivers/scsi/scsi_ioctl.c

···
 {
 	if (cmd == SG_SCSI_RESET && ndelay) {
 		if (scsi_host_in_recovery(sdev->host))
-			return -ENODEV;
+			return -EAGAIN;
 	} else {
 		if (!scsi_block_when_processing_errors(sdev))
 			return -ENODEV;