libata: move struct ata_scsi_args to libata-scsi.c

It's only used in libata-scsi.c, so move it closer to the users.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Tejun Heo <tj@kernel.org>
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 031a77a..43694f5 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -2057,6 +2057,13 @@ static int ata_scsi_translate(struct ata_device *dev, struct scsi_cmnd *cmd,
 		return SCSI_MLQUEUE_HOST_BUSY;
 }
 
+struct ata_scsi_args {
+	struct ata_device	*dev;
+	u16			*id;
+	struct scsi_cmnd	*cmd;
+	void			(*done)(struct scsi_cmnd *);
+};
+
 /**
  *	ata_scsi_rbuf_get - Map response buffer.
  *	@cmd: SCSI command containing buffer to be mapped.