fixed: close the mpd socket and stop the mpd client thread before exiting

src/bitvis.cpp

@@ -209,6 +209,9 @@ void CBitVis::Process()
   }
 
   m_jackclient.Disconnect();
+  m_mpdclient->StopThread();
+  delete m_mpdclient;
+  m_mpdclient = NULL;
 }
 
 void CBitVis::ProcessSignalfd()

src/mpdclient.cpp

@@ -35,13 +35,15 @@ void CMpdClient::Process()
     if (!GetCurrentSong() || !GetPlayStatus())
     {
       m_socket.Close();
-      USleep(10000000);
+      USleep(10000000, &m_stop);
     }
     else
     {
       USleep(1000000);
     }
   }
+
+  m_socket.Close();
 }
 
 bool CMpdClient::OpenSocket()