maps007: save core files in a error case

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

test/zdtm/live/transition/maps007.c

@@ -160,6 +160,7 @@ int main(int argc, char **argv)
 
 	return 0;
 err:
-	kill(child, SIGKILL);
+	kill(child, SIGSEGV);
+	*((int *) 0) = 0;
 	return 1;
 }