[quartz/tests]: Fix Coverity issue #760

[Kai Blin]

If CoCreateInstance() on line 1540 fails, it's safe to return, as no
cleanup is needed.

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Thanks to Paul Vriens for poking me to send this
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 dlls/quartz/tests/filtergraph.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
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