comdlg32: Initialize CommDlgExtendedError() return value for file dialogs

[Lei Zhang]

Hi,

The common dialog file open/save functions do not initialize the
CommDlgExtendedError() return value. This patch adds the
initialization and fixes bug 6829. Thanks to Anastasius Focht, we also
have an automated test for this bug.

--
 filedlg.c         |    6 ++
 tests/Makefile.in |    3 -
 tests/filedlg.c   |  104 ++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 112 insertions(+), 1 deletion(-)
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