Jan Alexander Steffens (heftig) 5aa825d004 multiqueue: Fix query unref race on flush
If the query has already been destroyed at this point, GST_IS_QUERY will
read garbage, can return false and we will try to unref it again.
Instead, make note of whether the item is a query when we dequeue it.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/1029>
2021-10-05 06:36:48 +00:00
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