copy_siginfo_from_user32() directly dereferences a user-pointer, which
is a no-no.  At that point, to->si_code already has been initialized
so I think we can just use to->si_code instead.  Compile-tested (only)
patch attached.

Signed-off-by: davidm@hpl.hp.com
Signed-off-by: Tony Luck <tony.luck@intel.com>