[Bug 758257] adaptivedemux: don't expose pads until caps are known

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=758257

--- Comment #6 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
This fixes it for me, but I think the condition variable and the expose counter
handling is a bit fragile. Probably needs to be reset in more cases, like in
general when streams are disappearing.

But now I first have to look at a crash in dashdemux, exposed by this.

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