kernel32: GetTempFileName should return 0 when the path isn't valid, including test

[Oskar Eisemuth]

GetTempFileName should check the path and should return zero if it
isn't a directory

New patch:
- the LastError is set to ERROR_DIRECTORY
- with new tests with unique 0 and 1

The new test passed on Wine and XP,
again see bug 17875.

---
 dlls/kernel32/path.c       |   10 ++++++++++
 dlls/kernel32/tests/path.c |   36 ++++++++++++++++++++++++++++++++++--
 2 files changed, 44 insertions(+), 2 deletions(-)
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