fixed compile issue

grid/walk/v2/modules/WalkModuleHeading.h

@@ -12,41 +12,6 @@
 
 #include "../../../../geo/Heading.h"
 
-/**
- * base-class e.g. needed for GridWalkHeading and GridWalkHeadingControl to work
- */
-struct WalkStateHeading {
-
-	/** used for better naming: heading.error instead of headingError */
-	struct _Heading {
-
-		/**
-		 * the direction [0:2pi] the walk should move to
-		 * e.g. indiciated by:
-		 *		compass
-		 *		integration over gyroscope values
-		 */
-		Heading direction;
-
-		/**
-		 * (cumulative) error between walked edges and requested direction (above).
-		 * is used to ensure that (even though the grid contains only 45° edges) we
-		 * approximately walk into the requested direction.
-		 */
-		float error = 0;
-
-		/** ctor */
-		_Heading(const Heading direction, const float error) : direction(direction), error(error) {;}
-
-	} heading;
-
-
-
-
-	/** ctor */
-	explicit WalkStateHeading(const Heading& direction, const float error) : heading(direction, error) {;}
-
-};