staging: rtl8192u: Fix warnings about endianness

drivers/staging/rtl8192u/ieee80211/ieee80211_rx.c:564:37: warning: incorrect type in assignment (different base types)
drivers/staging/rtl8192u/ieee80211/ieee80211_rx.c:564:37:    expected unsigned short [unsigned] [usertype] len
drivers/staging/rtl8192u/ieee80211/ieee80211_rx.c:564:37:    got restricted __be16 [usertype] <noident>

Signed-off-by: maomao xu <albert008.xu@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8192u/ieee80211/ieee80211_rx.c

@@ -559,10 +559,8 @@ void ieee80211_indicate_packets(struct ieee80211_device *ieee, struct ieee80211_
 				memcpy(skb_push(sub_skb, ETH_ALEN), prxb->src, ETH_ALEN);
 				memcpy(skb_push(sub_skb, ETH_ALEN), prxb->dst, ETH_ALEN);
 			} else {
-				u16 len;
 			/* Leave Ethernet header part of hdr and full payload */
-				len = htons(sub_skb->len);
-				memcpy(skb_push(sub_skb, 2), &len, 2);
+				put_unaligned_be16(sub_skb->len, skb_push(sub_skb, 2));
 				memcpy(skb_push(sub_skb, ETH_ALEN), prxb->src, ETH_ALEN);
 				memcpy(skb_push(sub_skb, ETH_ALEN), prxb->dst, ETH_ALEN);
 			}