[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

xarray/core/dask_array_ops.py

@@ -90,6 +90,7 @@ def _dtype_push(a, axis, dtype=None):
     )
 
     if n is not None and 0 < n < array.shape[axis] - 1:
+
         def _reset_cumsum(a, axis, dtype=None):
             cumsum = np.cumsum(a, axis=axis)
             reset_points = np.maximum.accumulate(np.where(a == 0, cumsum, 0), axis=axis)