Make sure we do not allocate urbs if we do not have a bulk endpoint.

Legacy code used incorrect assumption to test for bulk endpoints.
Reported-by: NDan Carpenter <dan.carpenter@oracle.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: NJohan Hovold <jhovold@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>