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

 drivers/ata/pata_hpt366.c:200: warning: Function parameter or member 'mask' not described in 'hpt366_filter'

Cc: Jens Axboe <axboe@kernel.dk>
Cc: Andre Hedrick <andre@linux-ide.org>
Cc: linux-ide@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>