(try 2)quartz: If the MediaSeeking is not implemented all the way up the passthru chain fall back to the filtergraph's clock to find position.

[Aric Stewart]

Resolves bug Bug 25606

try 2: ensure the reference clock is not null before using it.
---
  dlls/quartz/filtergraph.c |    9 ++++++++-
  1 files changed, 8 insertions(+), 1 deletions(-)


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