staging: r8822be: remove some dead code

"hdr" can't be NULL.  We take skb->data which is non-NULL and add an
offset to get "hdr".

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>