strmbase: we cannot hold the RenderLock during QualityControlRender_WaitFor

[Aric Stewart]

QualityControlRender_WaitFor could potentially block indefinitely 
blocking any ability to stop/pause or restart the filter.
---
  dlls/strmbase/renderer.c |    2 ++
  1 files changed, 2 insertions(+), 0 deletions(-)


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