Daniel28972897
b2cd050073
udev_device_get_parent() caches the result of device_new_from_parent() in udev_device->parent on first call. device_new_from_parent() sets errno correctly via return_with_errno() when it fails, so a caller gets the right errno on the first invocation. But on any subsequent call for the same object, the cached NULL is returned directly without recomputing anything, so errno reflects whatever happened in between rather than the original failure reason. Cache the errno alongside the parent pointer (new parent_errno field, zero-initialized like the rest of the struct via udev_device_new()'s compound literal) and restore it whenever the cached parent is NULL.
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