Plane: integrate ahrs::get_variances change

offset is no longer returned

ArduPlane/ekf_check.cpp

@@ -110,8 +110,7 @@ bool Plane::ekf_over_threshold()
     // A value above 1.0 means the EKF has rejected that sensor data
     float position_variance, vel_variance, height_variance, tas_variance;
     Vector3f mag_variance;
-    Vector2f offset;
-    if (!ahrs.get_variances(vel_variance, position_variance, height_variance, mag_variance, tas_variance, offset)) {
+    if (!ahrs.get_variances(vel_variance, position_variance, height_variance, mag_variance, tas_variance)) {
         return false;
     };