[Bug 791735] adaptivedemux: fix log integer format

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=791735

--- Comment #3 from Christian Hergert <christian at hergert.me> ---
Created attachment 366334
  --> https://bugzilla.gnome.org/attachment.cgi?id=366334&action=edit
cancellable: add g_cancellable_chain()

This allows cancelling a GCancellable when any number of
dependent GCancellable have been cancelled. This is useful when
you have multiple ways to cancel operations in an interface,
such as a cancellation button, and internal async API callbacks
from unrelated subsystems.

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