From 4.9 we should really avoid using the stack here as this will not be DMA
able on various platforms. This changes a buffer that was introduced in the
4.10 merge window.

Fixes: 6cc33eba ("ieee802154: atusb: try to read permanent extended
address from device")
Reported-by: NDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: NStefan Schmidt <stefan@osg.samsung.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>