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libei: Do not abort if LIBEI_SOCKET is not set

When called with NULL as the path to the EI socket, the function ei_setup_backend_socket() will fallback to the LIBEI_SOCKET environment variable to determine the path to the socket.

If that environment variable is not set, ei_setup_backend_socket() will abort.

That means that an innocent client running in an environment without EI support will be killed. If that client happens to be Xwayland, that would abort the Xserver and take all X11 clients with it, including the window manager itself in the case of mutter.

Return -ENOENT instead so that clients have a chance to recover and survive the lack of EI support.

Signed-off-by: Olivier Fourdan ofourdan@redhat.com

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