ata: pata_ali: Supply description for 'ali_20_filter()'s 'mask' param

Fixes the following W=1 kernel build warning(s):

drivers/ata/pata_ali.c:119: warning: Function parameter or member 'mask' not described in 'ali_20_filter'

Cc: Jens Axboe <[e-mail]>
Cc: CJ <[e-mail]>
Cc: Andre Hedrick <[e-mail]>
Cc: Alan Cox <[e-mail]>
Cc: Clear Zhang <[e-mail]>
Cc: [e-mail]
Cc: and cc <[e-mail]>
Signed-off-by: Lee Jones <[e-mail]>
Signed-off-by: Jens Axboe <[e-mail]>

drivers/ata/pata_ali.c

···
 /**
  *	ali_20_filter		-	filter for earlier ALI DMA
  *	@adev: ATA device
- *	@adev: attached device
+ *	@mask: received mask to manipulate and pass back
  *
  *	Ensure that we do not do DMA on CD devices. We may be able to
  *	fix that later on. Also ensure we do not do UDMA on WDC drives