STY: Apply ruff rule F841

F841 Local variable is assigned to but never used

Author: DimitriPapadopoulos

niworkflows/interfaces/tests/test_bids.py

@@ -571,7 +571,7 @@ def make_empty_nii_with_dtype(fname, dtype):
         for s in source_file:
             make_empty_nii_with_dtype(s, source_dtype)
 
-    prep, save = make_prep_and_save(
+    prep, _save = make_prep_and_save(
         interface,
         base_directory=str(tmp_path),
         data_dtype='source',

niworkflows/interfaces/tests/test_itk.py

@@ -50,7 +50,7 @@ def test_applytfms(tmpdir, ext, copy_dtype, in_dtype):
 
     ifargs = {'copy_dtype': copy_dtype, 'reference_image': in_file}
     args = (in_file, in_xform, ifargs, 0, str(tmpdir))
-    out_file, cmdline = _applytfms(args)
+    out_file, _cmdline = _applytfms(args)
 
     assert out_file == str(tmpdir / (f'src_xform-00000{ext}'))