Don't leak dbus_session_socket from flatpak_run_add_session_dbus_args
Don't leak dbus_session_socket from flatpak_run_add_session_dbus_args

The function was already leaking the result of
extract_unix_path_from_dbus_address() in the case where that call
succeeded. Since commit 0e545799 it would also leak the result of
g_build_filename in the case where it checked $XDG_RUNTIME_DIR/bus.

Signed-off-by: Simon McVittie <smcv@collabora.com>

Closes: #2877
Approved by: matthiasclasen

flatpak/flatpak,flatpak/flatpak,flatpak/flatpak,matthiasclasen/flatpak,matthiasclasen/flatpak,flatpak/flatpak,flatpak/flatpak,matthiasclasen/flatpak,matthiasclasen/flatpak,matthiasclasen/flatpak