RF: Use list comprehension in reordering

Author: effigies

nibabel/nifti1.py

@@ -2014,13 +2014,9 @@ def as_reoriented(self, ornt):
             return img
 
         # Also apply the transform to the dim_info fields
-        new_dim = list(img.header.get_dim_info())
-        for idx, value in enumerate(new_dim):
-            # For each value, leave as None if it was that way,
-            # otherwise check where we have mapped it to
-            if value is None:
-                continue
-            new_dim[idx] = ornt[value, 0]
+        new_dim = [
+            None if orig_dim is None else ornt[orig_dim, 0]
+            for orig_dim in img.header.get_dim_info()]
 
         img.header.set_dim_info(*new_dim)