restore: do not kill restored process on failure

While trying to resurrect the test cases in test/other/rpc one test case
was checking for returned errors during restore failures. The process
was dumping itself and while the process kept on running it tried to
restore from that checkpoint. That should fail as the PID is in use of
the process doing the test. CRIU, however, killed the test process
during restore failure.

This is the fix as proposed by Andrei Vagin on the CRIU mailing list.
Signed-off-by: Adrian Reber <areber@redhat.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>

criu/cr-restore.c

@@ -2254,8 +2254,8 @@ out_kill:
 		struct pstree_item *pi;
 
 		for_each_pstree_item(pi)
-			if (vpid(pi) > 0)
-				kill(vpid(pi), SIGKILL);
+			if (pi->pid->real > 0)
+				kill(pi->pid->real, SIGKILL);
 	}
 
 out: