scsi: libsas: Delete sas_ata_task.retry_count

Since libsas was introduced in commit 2908d77 ("[SCSI] aic94xx: new
driver"), sas_ata_task.retry_count is never set, so delete it and the
reference in asd_build_ata_ascb().

Signed-off-by: John Garry <john.g.garry@oracle.com>
Link: https://lore.kernel.org/r/20230815115156.343535-11-john.g.garry@oracle.com
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Jason Yan <yanaijie@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

Author: johnpgarry

drivers/scsi/aic94xx/aic94xx_task.c

@@ -388,7 +388,7 @@ static int asd_build_ata_ascb(struct asd_ascb *ascb, struct sas_task *task,
 		flags |= data_dir_flags[task->data_dir];
 		scb->ata_task.ata_flags = flags;
 
-		scb->ata_task.retry_count = task->ata_task.retry_count;
+		scb->ata_task.retry_count = 0;
 
 		scb->ata_task.flags = 0;
 	}

include/scsi/libsas.h

@@ -525,8 +525,6 @@ struct sas_ata_task {
 	struct host_to_dev_fis fis;
 	u8     atapi_packet[16];  /* 0 if not ATAPI task */
 
-	u8     retry_count;	  /* hardware retry, should be > 0 */
-
 	u8     dma_xfer:1;	  /* PIO:0 or DMA:1 */
 	u8     use_ncq:1;