Previously, invoking 'call' with an empty string would leave errorlevel
unchanged. Reset errorlevel to 0 to match the behavior of
the Windows 'cmd.exe'.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=49982Signed-off-by: Aaron Hill <aa1ronham@gmail.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>