The device (a POS terminal) implements CDC ACM, but has not union
descriptor.
Signed-off-by: NLubomir Rintel <lkundrak@v3.sk>
Acked-by: NOliver Neukum <oneukum@suse.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>