wl12xx: change type from u8 to int

ret is used to store int types.  Using an u8 will break the error
handling.

Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Luciano Coelho <coelho@ti.com>
diff --git a/drivers/net/wireless/wl12xx/init.c b/drivers/net/wireless/wl12xx/init.c
index 62dc983..6072fe4 100644
--- a/drivers/net/wireless/wl12xx/init.c
+++ b/drivers/net/wireless/wl12xx/init.c
@@ -483,7 +483,7 @@
 static int wl1271_set_ba_policies(struct wl1271 *wl)
 {
 	u8 tid_index;
-	u8 ret = 0;
+	int ret = 0;
 
 	/* Reset the BA RX indicators */
 	wl->ba_rx_bitmap = 0;