setupapi: Don't copy into a NULL PathBuffer, and remove an invalid check for size < MAX_PATH (Coverity 888).

[Ricardo Filipe]

my next task was to fix this eheh.
i think it would make more sense to just change

if(!params->PathBuffer && !params->PathBufferSize)

to

if(!params->PathBuffer)

as it was talked about in irc, it doesn't make much sense to check for
pathbuffersize when pathbuffer is null...
the max_path removal was a mistake from following msdn documentation :\

2009/3/22 James Hawkins <truiken at gmail.com>

> ---
>  dlls/setupapi/dialog.c |   12 +++++++-----
>  1 files changed, 7 insertions(+), 5 deletions(-)
>
>
>
>
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