staging: vt6656: vnt_set_keymode don't save pairwise key entry.

The device refuses to associate to older access points even though in
the logs it appears to be associated in tkip or ccmp mode.

Clear bit from key_entry_inuse in pairwise key so the entry is over written
by group address.

This doesn't seem to make any difference to newer access points and
is a temporary fix until a better solution is found.

Signed-off-by: Malcolm Priestley <tvboxspy@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/vt6656/key.c

@@ -98,6 +98,8 @@ static int vnt_set_keymode(struct ieee80211_hw *hw, u8 *mac_addr,
 	case  VNT_KEY_PAIRWISE:
 		key_mode |= mode;
 		key_inx = 4;
+		/* Don't save entry for pairwise key */
+		clear_bit(entry, &priv->key_entry_inuse);
 		break;
 	default:
 		return -EINVAL;