chdir fails when called without a trailing Backslash

http://reactos.org/forum/viewtopic.php?f=9&t=10958&p=89969

this fails on reactos:

source:
http://pastebin.com/ivZ3iR2r
compiled:
http://abma.de/tmp/test_chdir.exe

but works on windows, if c:\reactos is present

chdir to "C:\ReactOS" fails with "Invalid Buffer" while chdir to "C:\Reactos\" works fine.

(i hope i correctly chose the component)