GCS_MAVLink: adjust for min_length mavlink2 API change

libraries/GCS_MAVLink/GCS_Common.cpp

@@ -308,6 +308,7 @@ void GCS_MAVLINK::handle_mission_request(AP_Mission &mission, mavlink_message_t
         _mav_finalize_message_chan_send(chan, 
                                         MAVLINK_MSG_ID_MISSION_ITEM_INT,
                                         (const char *)&ret_packet,
+                                        MAVLINK_MSG_ID_MISSION_ITEM_MIN_LEN,
                                         MAVLINK_MSG_ID_MISSION_ITEM_INT_LEN,
                                         MAVLINK_MSG_ID_MISSION_ITEM_INT_CRC);
     } else {
@@ -349,6 +350,7 @@ void GCS_MAVLINK::handle_mission_request(AP_Mission &mission, mavlink_message_t
         _mav_finalize_message_chan_send(chan, 
                                         MAVLINK_MSG_ID_MISSION_ITEM,
                                         (const char *)&ret_packet,
+                                        MAVLINK_MSG_ID_MISSION_ITEM_MIN_LEN,
                                         MAVLINK_MSG_ID_MISSION_ITEM_LEN,
                                         MAVLINK_MSG_ID_MISSION_ITEM_CRC);
     }

libraries/GCS_MAVLink/GCS_Logs.cpp

@@ -238,7 +238,9 @@ bool GCS_MAVLINK::handle_log_send_data(DataFlash_Class &dataflash)
     packet.id = _log_num_data;
     packet.count = ret;
     _mav_finalize_message_chan_send(chan, MAVLINK_MSG_ID_LOG_DATA, (const char *)&packet, 
-                                    MAVLINK_MSG_ID_LOG_DATA_LEN, MAVLINK_MSG_ID_LOG_DATA_CRC);
+                                    MAVLINK_MSG_ID_LOG_DATA_MIN_LEN,
+                                    MAVLINK_MSG_ID_LOG_DATA_LEN,
+                                    MAVLINK_MSG_ID_LOG_DATA_CRC);
 
     _log_data_offset += len;
     _log_data_remaining -= len;

libraries/GCS_MAVLink/GCS_serial_control.cpp

@@ -154,6 +154,7 @@ more_data:
     _mav_finalize_message_chan_send(chan, 
                                     MAVLINK_MSG_ID_SERIAL_CONTROL,
                                     (const char *)&packet,
+                                    MAVLINK_MSG_ID_SERIAL_CONTROL_MIN_LEN,
                                     MAVLINK_MSG_ID_SERIAL_CONTROL_LEN,
                                     MAVLINK_MSG_ID_SERIAL_CONTROL_CRC);
     if ((flags & SERIAL_CONTROL_FLAG_MULTI) && packet.count != 0) {