gpiod: repeatable segfault when releasing second set of claimed lines on a single chip

[Gadgetoid]

Afaict this code always results in a segfault when b.release() is called. Presumably somewhere in the plumbing of gpiod there's an assumption that there will only be one claim against a given gpiochip device, this cannot be guaranteed across multi-library Python projects.

Notably, simply omitting any cleanup - I had .release() in an atexit handler in the Blinkt! lib - fixes this, so perhaps we can just rely on the lines being implicitly released. Though again this may not be possible to guarantee in some cases.

Repro (given line and chip values are GPIO23 and GPIO24 on a Raspberry Pi 400, a Pi 5 would use /dev/gpiochip4):

import gpiod
from gpiod.line import Direction, Value

a = gpiod.request_lines("/dev/gpiochip0", consumer="test", config={
    23: gpiod.LineSettings(direction=Direction.OUTPUT, output_value=Value.INACTIVE)
})

b = gpiod.request_lines("/dev/gpiochip0", consumer="test", config={
    24: gpiod.LineSettings(direction=Direction.OUTPUT, output_value=Value.INACTIVE)
})

a.release()
b.release()

[Gadgetoid]

I believe this was due to the way I stubbed out request_chip_name