exec: Move the comment from above de_thread to above unshare_sighand
The comment describes work that now happens in unshare_sighand so move the comment where it makes sense. Link: https://lkml.kernel.org/r/87mu6i6zcs.fsf_-_@x220.int.ebiederm.org Reviewed-by: Kees Cook <keescook@chromium.org> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
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