Plane: fixed mavlink fetch of 16 character parameter

ArduPlane/GCS_Mavlink.pde

@@ -1334,7 +1334,7 @@ void GCS_MAVLINK::handleMessage(mavlink_message_t* msg)
         if (mavlink_check_target(packet.target_system,packet.target_component)) break;
         enum ap_var_type p_type;
         AP_Param *vp;
-        char param_name[AP_MAX_NAME_SIZE];
+        char param_name[AP_MAX_NAME_SIZE+1];
         if (packet.param_index != -1) {
             AP_Param::ParamToken token;
             vp = AP_Param::find_by_index(packet.param_index, &p_type, &token);
@@ -1342,14 +1342,16 @@ void GCS_MAVLINK::handleMessage(mavlink_message_t* msg)
                 gcs_send_text_fmt(PSTR("Unknown parameter index %d"), packet.param_index);
                 break;
             }
-            vp->copy_name_token(&token, param_name, sizeof(param_name), true);
+            vp->copy_name_token(&token, param_name, AP_MAX_NAME_SIZE, true);
+            param_name[AP_MAX_NAME_SIZE] = 0;
         } else {
-            vp = AP_Param::find(packet.param_id, &p_type);
+            strncpy(param_name, packet.param_id, AP_MAX_NAME_SIZE);
+            param_name[AP_MAX_NAME_SIZE] = 0;
+            vp = AP_Param::find(param_name, &p_type);
             if (vp == NULL) {
                 gcs_send_text_fmt(PSTR("Unknown parameter %.16s"), packet.param_id);
                 break;
             }
-            strncpy(param_name, packet.param_id, AP_MAX_NAME_SIZE);
         }
 
         float value = vp->cast_to_float(p_type);