rtl8xxxu: Correct txdesc40 gid definition

txdesc40 dword2 gid is a 6 bit field, not a single bit
Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu.h

@@ -464,7 +464,7 @@ struct rtl8xxxu_txdesc40 {
 #define TXDESC40_SPE_RPT		BIT(19)
 #define TXDESC_AMPDU_DENSITY_SHIFT	20
 #define TXDESC40_BT_INT			BIT(23)
-#define TXDESC40_GID			BIT(24)
+#define TXDESC40_GID_SHIFT		24
 
 /* Word 3 */
 #define TXDESC40_USE_DRIVER_RATE	BIT(8)