修复camera空指针判断

ArduCopter/mode_auto.cpp

@@ -1172,8 +1172,11 @@ Location ModeAuto::loc_from_cmd(const AP_Mission::Mission_Command& cmd) const
 void ModeAuto::do_nav_wp(const AP_Mission::Mission_Command& cmd)
 {
     Location target_loc = loc_from_cmd(cmd);
-   AP::camera()->cameras_take_enable = AP::camera()->cameras_take_enable_new;
-   AP::camera()->cameras_take_enable_new = cmd.content.location.cams_enable_bit;
+    AP_Camera *camera = AP::camera();
+    if (camera != nullptr) {
+        camera->cameras_take_enable = AP::camera()->cameras_take_enable_new;
+        camera->cameras_take_enable_new = cmd.content.location.cams_enable_bit;
+    }
    //gcs().send_text(MAV_SEVERITY_INFO,"NOTICE:WP:%d,p3:%d",cmd.index,AP::camera()->cameras_take_enable_new); //TODO DEBUG!!!
     // this will be used to remember the time in millis after we reach or pass the WP.
     loiter_time = 0;

modules/mavlink

@@ -1 +1 @@
-Subproject commit 18cab6950986cd7b9b7a507ec35f3501d4a7e019
+Subproject commit 0013b46db8cb437b6ad77d736263597d90a2262d