rt2x00:correct rx packet length for USB devices

When fixing up the packet alignment, if we had to add 2 bytes to the front of
the skb we need to remember to take them off the end afterwards. This fixes
reception of encrypted packets which were otherwise failing with an invalid
ICV.
Signed-off-by: NAdam Baker <linux@baker-net.org.uk>
Signed-off-by: NIvo van Doorn <IvDoorn@gmail.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/rt2x00/rt2x00usb.c

@@ -299,6 +299,7 @@ static void rt2x00usb_interrupt_rxdone(struct urb *urb)
 		memmove(entry->skb->data, entry->skb->data + 2,
 			entry->skb->len - 2);
 		skbdesc->data = entry->skb->data;
+		skb_trim(entry->skb,entry->skb->len - 2);
 	}
 
 	/*