scsi: libsas: Add missing annotation for sas_ata_qc_issue()

Sparse reports a warning at sas_ata_qc_issue()

warning: context imbalance in sas_ata_qc_issue() - unexpected unlock
The root cause is the missing annotation at sas_ata_qc_issue()

Add the missing __must_hold(ap->lock) annotation

Link: https://lore.kernel.org/r/[email protected]
Reviewed-by: John Garry <[email protected]>
Signed-off-by: Jules Irenge <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>

drivers/scsi/libsas/sas_ata.c

@@ -160,6 +160,7 @@ static void sas_ata_task_done(struct sas_task *task)
 }
 
 static unsigned int sas_ata_qc_issue(struct ata_queued_cmd *qc)
+	__must_hold(ap->lock)
 {
 	struct sas_task *task;
 	struct scatterlist *sg;