drivers/ata/: Spelling fixes

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Adrian Bunk <bunk@kernel.org>
diff --git a/drivers/ata/ata_piix.c b/drivers/ata/ata_piix.c
index 47892e6..4b99ed0 100644
--- a/drivers/ata/ata_piix.c
+++ b/drivers/ata/ata_piix.c
@@ -837,7 +837,7 @@
 	if (is_slave) {
 		/* clear TIME1|IE1|PPE1|DTE1 */
 		master_data &= 0xff0f;
-		/* Enable SITRE (seperate slave timing register) */
+		/* Enable SITRE (separate slave timing register) */
 		master_data |= 0x4000;
 		/* enable PPE1, IE1 and TIME1 as needed */
 		master_data |= (control << 4);