of iso packets matching the buffer size. This guarantees that the
transfer size is smaller or equal to the buffer.
Device will transfer less data if iso transfer response does not utilize the
maximum available number of iso packets per microframe or doesn't fill
the packets entirely.
The libusb_get_max_iso_packet_size ignores the endpoint information and
will return the same size for all endpoints, even if the current
alternative configuration does not support given size.
This reverts commit a6e284610b.
