Resend pdh[2:3]: check for size > 0 but no buffer

[Jeff Latimer]

This fixes the same problem as fixed by Marcus Meissner on 26/1/08 for 
PdhLookupPerfNameByIndexW but for PdhLookupPerfNameByIndexA.

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   dlls/pdh/pdh_main.c |    2 +-
   1 files changed, 1 insertions(+), 1 deletions(-)

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