The whole idea behind this code was to stop receiving CHLD from
restored tasks after resume. The comment about this is done for
scripts is wrong (we call more scripts before this) because
sigchld_handler() knows about scripts:

commit de71bc69
	 exit = (siginfo->si_code == CLD_EXITED);
	 status = siginfo->si_status;
	+
	+       /* skip scripts */
	+       if (!current && root_item->pid.real != pid) {
	+               pid = waitpid(root_item->pid.real, &status, WNOHANG);
	+               if (pid <= 0)
	+                       return;
	+       }

And since CHLD handler makes little sence after exec, it's easier
just to reset one to default action at the end.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Acked-by: Andrew Vagin <avagin@parallels.com>