vmount: properly unadvertise uorb topics when stopping or re-configuring vmount. Othwerise subsequent advertise calls may fail (only ever witnessed for _mount_orientation_pub)

src/drivers/vmount/output.cpp

@@ -68,6 +68,10 @@ OutputBase::~OutputBase()
 	if (_vehicle_global_position_sub >= 0) {
 		orb_unsubscribe(_vehicle_global_position_sub);
 	}
+
+	if (_mount_orientation_pub) {
+		orb_unadvertise(_mount_orientation_pub);
+	}
 }
 
 int OutputBase::initialize()

src/drivers/vmount/output_mavlink.cpp

@@ -52,6 +52,13 @@ OutputMavlink::OutputMavlink(const OutputConfig &output_config)
 {
 }
 
+OutputMavlink::~OutputMavlink()
+{
+	if (_vehicle_command_pub) {
+		orb_unadvertise(_vehicle_command_pub);
+	}
+}
+
 int OutputMavlink::update(const ControlData *control_data)
 {
 	vehicle_command_s vehicle_command = {

src/drivers/vmount/output_mavlink.h

@@ -56,7 +56,7 @@ class OutputMavlink : public OutputBase
 {
 public:
 	OutputMavlink(const OutputConfig &output_config);
-	virtual ~OutputMavlink() { }
+	~OutputMavlink();
 
 	virtual int update(const ControlData *control_data);