[libata] Update docs to reflect current driver API
diff --git a/drivers/scsi/libata-core.c b/drivers/scsi/libata-core.c
index d73cb36..89c3fbe 100644
--- a/drivers/scsi/libata-core.c
+++ b/drivers/scsi/libata-core.c
@@ -3496,7 +3496,7 @@
 
 /**
  *	ata_mmio_data_xfer - Transfer data by MMIO
- *	@dev: device for this I/O
+ *	@adev: device for this I/O
  *	@buf: data buffer
  *	@buflen: buffer length
  *	@write_data: read/write