Refuse to change the configuration index if the device has open pipes, since open pipes are linked off a usbd_interface structure that is free()'d when the configuration index is changed. Attempting to close or use such pipes later would access freed memory and usually crash the system.
Refuse to change the configuration index if the device has open
pipes, since open pipes are linked off a usbd_interface structure
that is free()'d when the configuration index is changed. Attempting
to close or use such pipes later would access freed memory and
usually crash the system.

The only driver that is known to trigger this problem is if_axe,
which is itself at fault, but it is worth detecting the situation
to avoid the obscure crashes that result from this type of easily
made driver mistakes.

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