This addresses two warnings issues by GCC 10 (currently in development
stage 4, so this is unlikely to change):

msc.c:687:9: warning: 'value' may be used uninitialized in this function
msc.c:301:13: warning: 'value' may be used uninitialized in this function
Signed-off-by: Gerald Pfeifer <gerald@pfeifer.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>