baseaudiosink: protect against ringbuffer disappearing while in a query
Observed a case where the sink went to null-state during the query, hence the ringbuffer-pointer was NULL, causing a crash. Moving the ringbuffer-check code until after the query, and hold the lock during the check and while using the spec-values. It should not matter to the query wether the ringbuffer is present or not, and it actually gets a time bit more time to get the ringbuffer set up in this case! Fixes #635231
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