iwlegacy: move IL_MASK

Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
diff --git a/drivers/net/wireless/iwlegacy/4965-mac.c b/drivers/net/wireless/iwlegacy/4965-mac.c
index 2bab0fc..dbe5bf2 100644
--- a/drivers/net/wireless/iwlegacy/4965-mac.c
+++ b/drivers/net/wireless/iwlegacy/4965-mac.c
@@ -4944,6 +4944,8 @@
 	IL_TX_FIFO_UNUSED,
 };
 
+#define IL_MASK(lo, hi) ((1 << (hi)) | ((1 << (hi)) - (1 << (lo))))
+
 static int il4965_alive_notify(struct il_priv *il)
 {
 	u32 a;