ata: pata_macio: Remove unneeded word in comments

There is unneeded word "to" in line 669, so remove it.
Signed-off-by: Shaomin Deng <dengshaomin@cdjrlc.com>
Reviewed-by: Sergey Shtylyov <s.shtylyov@omp.ru>
Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>

drivers/ata/pata_macio.c

@@ -666,8 +666,7 @@ static u8 pata_macio_bmdma_status(struct ata_port *ap)
 	 * a multi-block transfer.
 	 *
 	 * - The dbdma fifo hasn't yet finished flushing to
-	 * to system memory when the disk interrupt occurs.
-	 *
+	 * system memory when the disk interrupt occurs.
 	 */
 
 	/* First check for errors */