re: shlwapi: Put correct return values in SetFromTimeInterval

[Dan Kegel]

(The buildbot worked its way back to the day after Alexandre went on vacation.
Even though the patches are old, git hasn't changed, so they ought to
apply still.)

It didn't apply here:

patching file dlls/shlwapi/string.c
patching file dlls/shlwapi/tests/string.c
Hunk #1 FAILED at 622.
Hunk #2 FAILED at 639.
Hunk #3 FAILED at 649.
3 out of 3 hunks FAILED -- saving rejects to file
dlls/shlwapi/tests/string.c.rej

Log at
http://buildbot.kegel.com/builders/runtests/builds/80
for the next day or so.