Fixes a regression from 699e0a55,
making "winetricks dotnet30sp1" fail.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=49831Signed-off-by: Rémi Bernon <rbernon@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>