tests: Fix check loop mt test

test_th was accesed both by main thread and loop_timer thread resulting in
failure. Fix is to access test_tht in loop_timer thread.

Signed-off-by: Jan Friesse <jfriesse@redhat.com>

tests/check_loop.c

@@ -448,7 +448,7 @@ static void *loop_timer_thread(void *arg)
 	res = qb_loop_timer_add(l, QB_LOOP_LOW, 5*QB_TIME_NS_IN_MSEC, l, one_shot_tmo, &test_tht);
 	ck_assert_int_eq(res, 0);
 
-	res = qb_loop_timer_is_running(l, test_th);
+	res = qb_loop_timer_is_running(l, test_tht);
 	ck_assert_int_eq(res, QB_TRUE);
 
 	sleep(5);