[Bug 768579] improve some debug/log output

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=768579

--- Comment #2 from Guillaume Desmottes <gdesmott at gnome.org> ---
Created attachment 331089
  --> https://bugzilla.gnome.org/attachment.cgi?id=331089&action=edit
miniobject: weak_unref: display the pointer of the object if failing

That's generally the most useful information to help debugging the
problem.

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