restore: sigreturn_restore: free core _after_ using it

Currently we have this:
	.......
	/* No longer need it */
	core_entry__free_unpacked(core, NULL);

	ret = prepare_itimers(pid, core, task_args);
	if (ret < 0)
		goto err;
	.......

So we're using ptr right after free-ing it.
Signed-off-by: Ruslan Kuprieiev <kupruser@gmail.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

cr-restore.c

@@ -2645,9 +2645,6 @@ static int sigreturn_restore(pid_t pid, CoreEntry *core)
 
 	new_sp = restorer_stack(task_args->t);
 
-	/* No longer need it */
-	core_entry__free_unpacked(core, NULL);
-
 	ret = prepare_itimers(pid, core, task_args);
 	if (ret < 0)
 		goto err;
@@ -2660,6 +2657,9 @@ static int sigreturn_restore(pid_t pid, CoreEntry *core)
 	if (ret < 0)
 		goto err;
 
+	/* No longer need it */
+	core_entry__free_unpacked(core, NULL);
+
 	/*
 	 * Open the last_pid syscl early, since restorer (maybe) lives
 	 * in chroot and has no access to "/proc/..." paths.