eeepc-wmi: set the right key code for 0xe9

This key should power off the backlight, not the display,
it is also used in acpi/video.c to do the same thing.
Signed-off-by: NCorentin Chary <corentincj@iksaif.net>
Signed-off-by: NMatthew Garrett <mjg@redhat.com>

drivers/platform/x86/eeepc-wmi.c

@@ -103,7 +103,7 @@ static const struct key_entry eeepc_wmi_keymap[] = {
 	{ KE_KEY, 0xcc, { KEY_SWITCHVIDEOMODE } },
 	{ KE_KEY, 0xe0, { KEY_PROG1 } },
 	{ KE_KEY, 0xe1, { KEY_F14 } },
-	{ KE_KEY, 0xe9, { KEY_DISPLAY_OFF } },
+	{ KE_KEY, 0xe9, { KEY_BRIGHTNESS_ZERO } },
 	{ KE_END, 0},
 };