adb: fix uninitialized variable in AsyncServiceRef.

Bug: none
Test: treehugger
Change-Id: I8ba0a70a772f88bfd701730a48d4eb32c6677b9e
diff --git a/adb/client/transport_mdns.cpp b/adb/client/transport_mdns.cpp
index 3603f09..01f140a 100644
--- a/adb/client/transport_mdns.cpp
+++ b/adb/client/transport_mdns.cpp
@@ -87,7 +87,7 @@
     }
 
   private:
-    bool initialized_;
+    bool initialized_ = false;
     fdevent fde_;
 };