NativeReactor needs to always end in stopped state

(under normal circumstances)

CHANGELOG

@@ -1,3 +1,8 @@
+### 1.0.9
+
+- Fix NativeReactor not ending up in stopped state if primary
+  callback didn't install any events.
+
 ### 1.0.8
 
 - Fix NativeReactor running a busy loop if no timers are active.

lib/NativeReactor.php

@@ -58,6 +58,7 @@ class NativeReactor implements Reactor {
             $this->state = self::STARTING;
             $watcherId = $this->immediately($onStart);
             if (!$this->tryImmediate($this->watchers[$watcherId]) || empty($this->keepAliveCount)) {
+                $this->state = self::STOPPED;
                 return;
             }
         } else {