comdlg32: Fix a leak.

[Ken Thomases]

The code was only calling MemFree when the pointer was already NULL, as
opposed to when it was non-NULL.  The test was unnecessary, anyway.
---
dlls/comdlg32/filedlg.c |    3 +--
1 files changed, 1 insertions(+), 2 deletions(-)

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