[PATCH] eligible_child: remove an obsolete ->tgid check

It is not possible to find a sub-thread in ->children/->ptrace_children
lists, ptrace_attach() does not allow to attach to sub-threads.

Even if it was possible to ptrace the task from the same thread group,
we can't allow to release ->group_leader while there are others (ptracer)
threads in the same group.

Signed-off-by: Oleg Nesterov <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

kernel/exit.c

···
 	 * Do not consider thread group leaders that are
 	 * in a non-empty thread group:
 	 */
-	if (current->tgid != p->tgid && delay_group_leader(p))
+	if (delay_group_leader(p))
 		return 2;
 
 	if (security_task_wait(p))