[odbccp32] Don't print *pcbPathOut as it can be NULL (Coverity)

[Paul Vriens]

Hi,

pcbPathOut can be NULL so we shouldn't print the contents in a TRACE.
I've added some simple tests to prove it can be NULL.

Should fix Coverity CID-527.

Changelog
  Don't print *pcbPathOut as it can be NULL

Cheers,

Paul.
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