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Don't leak screen cast DMA buffers

Jonas Ådahl requested to merge jadahl/mutter:wip/dont-leak-screen-cast-dmabufs into master

This needs two commits in PipeWire to make any difference:

commit fbaa4ddedd84afdffca16f090dcc4b0db8ccfc29
Author: Wim Taymans <wtaymans@redhat.com>
Date:   Mon Jun 1 15:36:09 2020 +0200

    stream: allow NULL param and 0 buffers in disconnect
    
    When we are disconnecting, cleanup code might clear the params
    and buffers, make sure we allow this to happen and the call the
    right callbacks.

and

1098683168c7caf18eca48b37926ff3bd
Author: Wim Taymans <wtaymans@redhat.com>
Date:   Tue Jun 2 15:19:39 2020 +0200

    client-node: keep track of the client allocated fd
    
    when we get port_buffers with memory from the client, store this
    in the buffer data and make sure we close the fd when the buffers
    are removed.

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