take m_daemon_rpc_mutex in wallet2::get_daemon_address

src/wallet/wallet2.cpp

@@ -12667,6 +12667,7 @@ std::string wallet2::get_keys_file() const
 
 std::string wallet2::get_daemon_address() const
 {
+  boost::lock_guard lock(m_daemon_rpc_mutex);
   return m_daemon_address;
 }
 

src/wallet/wallet2.h

@@ -1659,7 +1659,7 @@ private:
 
     std::atomic<bool> m_run;
 
-    boost::recursive_mutex m_daemon_rpc_mutex;
+    mutable boost::recursive_mutex m_daemon_rpc_mutex;
 
     bool m_trusted_daemon;
     i_wallet2_callback* m_callback;