rt2x00: Fix setting of txdesc->length field.

We should take the stripping of the IV into account for the txdesc->length
field.
Signed-off-by: Gertjan van Wingerde <gwingerde@gmail.com>
Acked-by: Ivo van Doorn <IvDoorn@gmail.com>
Tested-by: Pavel Roskin <proski@gnu.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/rt2x00/rt2x00crypto.c

@@ -128,6 +128,7 @@ void rt2x00crypto_tx_remove_iv(struct sk_buff *skb, struct txentry_desc *txdesc)
 
 	/* Pull buffer to correct size */
 	skb_pull(skb, txdesc->iv_len);
+	txdesc->length -= txdesc->iv_len;
 
 	/* IV/EIV data has officially been stripped */
 	skbdesc->flags |= SKBDESC_IV_STRIPPED;