staging: rtl8723au: set_qos() keep userpriority in a u8

Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8723au/core/rtw_xmit.c

@@ -404,7 +404,7 @@ static void set_qos(struct sk_buff *skb, struct pkt_attrib *pattrib)
 {
 	u8 *pframe = skb->data;
 	struct iphdr *ip_hdr;
-	s32 UserPriority = 0;
+	u8 UserPriority = 0;
 
 	/*  get UserPriority from IP hdr */
 	if (pattrib->ether_type == ETH_P_IP) {