pdh: check for NULL pointer reference

[Jeff Latimer]

This function has specific XP behaviour which I have tested but I have 
not been able to verify that Win2k etc works the same.  Any comment welcome.

Jeff

---
  dlls/pdh/pdh_main.c  |    2 ++
  dlls/pdh/tests/pdh.c |    8 ++++++++
  2 files changed, 10 insertions(+), 0 deletions(-)
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