ata: pata_ali: remove redundant return statement

A return statement is unnecessarily complicated, currently value
in variable mask is bitwise-masked and the variable is being
updated and then returned. Just updating the mask is all that is
required as the following statement is a return.
Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>

drivers/ata/pata_ali.c

@@ -123,7 +123,7 @@ static unsigned long ali_20_filter(struct ata_device *adev, unsigned long mask)
 		mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
 	ata_id_c_string(adev->id, model_num, ATA_ID_PROD, sizeof(model_num));
 	if (strstr(model_num, "WDC"))
-		return mask &= ~ATA_MASK_UDMA;
+		mask &= ~ATA_MASK_UDMA;
 	return mask;
 }