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meta-xwayland: Fix some FD leaks on error paths

Philip Withnall requested to merge pwithnall/mutter:meta-xwayland-fd-leaks into master

If meta_xwayland_start_xserver() returned via an error path, some of the socket FDs were leaked.

Fix that, and add steal_fd() calls to make it clearer that FDs passed to g_subprocess_launcher_take_fd() are transferred to it. There were no bugs with how GSubprocessLauncher was being used.

Spotted while working on glib#2332 (closed).

Signed-off-by: Philip Withnall pwithnall@endlessos.org

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