gio: Mark DBusInterface.get_info's return value as nullable

[bash]

It looks to me like DBusInterface.get_info can return null.

DBusProxy, which implements DBusInterface returns null if it is created without an interface info. The DBusProxy-specific function get_interface_info is even marked as nullable.

let proxy = DBusProxy::for_bus_future(
    BusType::Session,
    DBusProxyFlags::NONE,
    None,
    "org.freedesktop.portal.Desktop",
    "/org/freedesktop/portal/desktop",
    "org.freedesktop.portal.NetworkMonitor",
)
.await
.unwrap();
let _info = proxy.info();
// thread 'main' (175265) panicked at /home/tau/Source/GNOME/Rust/gtk-rs-core/glib/src/shared.rs:557:9:
// assertion failed: !ptr.is_null()

[bilelmoussaoui]

you should send this upstream instead

[sdroege]

https://gitlab.gnome.org/GNOME/glib/-/merge_requests/4856

[bash]

Whaaa you were so fast 😅

[sdroege]

Had to do that so often, it's part of muscle memory already 🤣