Disconnecting a device freezes sometimes

[jfedor2]

I noticed that disconnecting a USB device from a Pico acting as a host sometimes causes the code to freeze.

It doesn't happen every time, but maybe like 1 in 10, often enough to notice.

I have bisected the issue down to this commit: 30283a9

The freeze seems to be happening around here:

Pico-PIO-USB/src/pio_usb.c

Line 195 in 528616d

while ((pp->pio_usb_rx->irq & IRQ_RX_COMP_MASK) == 0) {

[sweetlilmre]

I think this is a duplicate of #142