HID: lenovo: Use constants for axes names

Signed-off-by: Jamie Lentin <jm@lentin.co.uk>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/drivers/hid/hid-lenovo.c b/drivers/hid/hid-lenovo.c
index 4f59bff..680bb11 100644
--- a/drivers/hid/hid-lenovo.c
+++ b/drivers/hid/hid-lenovo.c
@@ -146,10 +146,10 @@
 
 		switch (usage->hid & HID_USAGE) {
 		case 0x0000:
-			hid_map_usage(hi, usage, bit, max, EV_REL, 0x06);
+			hid_map_usage(hi, usage, bit, max, EV_REL, REL_HWHEEL);
 			return 1;
 		case 0x0001:
-			hid_map_usage(hi, usage, bit, max, EV_REL, 0x08);
+			hid_map_usage(hi, usage, bit, max, EV_REL, REL_WHEEL);
 			return 1;
 		default:
 			return -1;