message: simplifies conditional inside wait_for_arrival()
diff: @@ -303,12 +303,12 @@ class SmoothieDriver_2_0_0(SmoothieDriver):
  for axis in list(target.keys()):
  diff[axis] = current[axis] - target[axis]
  dist = pow(diff['x'], 2) + pow(diff['y'], 2) + pow(diff['z'], 2)
  - dist_head = math.sqrt(dist)
  + diff_head = math.sqrt(dist)
  + diff_a = abs(diff.get('a', 0))
  + diff_b = abs(diff.get('b', 0))
  - if dist_head < tolerance:
  - if abs(diff['a']) < tolerance:
  - if abs(diff.get('b', 0)) < tolerance:
  - break
  + if max(diff_head, diff_a, diff_b) < tolerance:
  + return
  def home(self, *axis):
  