Avoid Profile Function Using Invalid File Handle

[Robert Shearman]

Hi,

The previous code would use an invalid file handle, resulting in false 
information being put into the logs. Not only that, some of the code was 
only used when logging. So I have protected against using an invalid 
file handle and made the code that gets the timestamp from the file 
depend on being traced.

Rob

Changelog:
- Don't use an invalid file handle. In this case invalid file handle 
means that the file hasn't yet been created.
- Only call GetFileTime when we are being logged for a tiny performance 
improvement.
- Reindent to 4 spaces.
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