event/Loop: move the "again" check out of the mutex scope

src/event/Loop.cxx

@@ -330,15 +330,14 @@ EventLoop::Run() noexcept
 			const std::lock_guard<Mutex> lock(mutex);
 			HandleInject();
 			busy = false;
-
-			if (again)
-				/* re-evaluate timers because one of
-				   the IdleEvents may have added a
-				   new timeout */
-				continue;
 		}
 #endif
 
+		if (again)
+			/* re-evaluate timers because one of the
+			   DeferEvents may have added a new timeout */
+			continue;
+
 		/* wait for new event */
 
 		Wait(timeout);