fix #434

src/main/scala/com/github/shadowsocks/ShadowsocksVpnThread.scala

@@ -117,10 +117,11 @@ class ShadowsocksVpnThread(vpnService: ShadowsocksVpnService) extends Thread {
               } else {
                 output.write(1)
               }
-
-              input.close()
-              output.close()
             }
+
+            input.close()
+            output.close()
+
           } catch {
             case e: Exception =>
               Log.e(TAG, "Error when protect socket", e)