[Bug 783256] adaptivedemux: make sure to free all "old streams"

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=783256

--- Comment #2 from Mathieu Duponchelle <mduponchelle1 at gmail.com> ---
To reproduce this error, first apply
https://bugzilla.gnome.org/show_bug.cgi?id=783255 (otherwise you'll deadlock
before even getting there), then simply run:

gst-validate-launcher --mute -t 'validate.hls.media_check.bipbopall_m3u8'
--forever

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