fix stop function of idle/check/prepare/child

ev.c

@@ -1436,7 +1436,7 @@ void
 ev_idle_stop (EV_P_ struct ev_idle *w)
 {
   ev_clear_pending (EV_A_ (W)w);
-  if (!ev_is_active (w))
+  if (ev_is_active (w))
     return;
 
   idles [((W)w)->active - 1] = idles [--idlecnt];
@@ -1458,7 +1458,7 @@ void
 ev_prepare_stop (EV_P_ struct ev_prepare *w)
 {
   ev_clear_pending (EV_A_ (W)w);
-  if (!ev_is_active (w))
+  if (ev_is_active (w))
     return;
 
   prepares [((W)w)->active - 1] = prepares [--preparecnt];
@@ -1551,7 +1551,7 @@ void
 ev_child_stop (EV_P_ struct ev_child *w)
 {
   ev_clear_pending (EV_A_ (W)w);
-  if (ev_is_active (w))
+  if (!ev_is_active (w))
     return;
 
   wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);