added is_client_connected method to remote_bitbang class

riscv/remote_bitbang.cc

@@ -184,3 +184,7 @@ void remote_bitbang_t::execute_commands()
     }
   }
 }
+
+bool remote_bitbang_t::is_client_connected() const{
+    return client_fd != 0;
+}

riscv/remote_bitbang.h

@@ -15,6 +15,9 @@ public:
   // Do a bit of work.
   void tick();
 
+  // Check if any client is connected
+  bool is_client_connected() const;
+
 private:
   jtag_dtm_t *tap;