USB: cypress_m8: add endpoint sanity check

An attack using missing endpoints exists.

CVE-2016-3137

Change-Id: I6348fe8b2165e7fcd1ac11c99ed63cc669f373f7
Signed-off-by: Oliver Neukum <ONeukum@suse.com>
CC: stable@vger.kernel.org
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>