toolhead: Add a move.move_error() helper

Move the EndstopMoveError() code from homing.py to a new method in the
toolhead Move class.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

klippy/toolhead.py

@@ -54,6 +54,10 @@ class Move:
         self.accel = min(self.accel, accel)
         self.delta_v2 = 2.0 * self.move_d * self.accel
         self.smooth_delta_v2 = min(self.smooth_delta_v2, self.delta_v2)
+    def move_error(self, msg="Move out of range"):
+        pos = self.end_pos
+        return homing.EndstopError("%s: %.3f %.3f %.3f [%.3f]"
+                                   % (msg, pos[0], pos[1], pos[2], pos[3]))
     def calc_junction(self, prev_move):
         if not self.is_kinematic_move or not prev_move.is_kinematic_move:
             return