Refactor: Fix error raised by linter

onadata/apps/api/viewsets/xform_viewset.py

@@ -685,7 +685,6 @@ def data_import(self, request, *args, **kwargs):
 
             else:
                 if xls_file and xls_file.name.split(".")[-1] in XLS_EXTENSIONS:
-                    xls_file_name = xls_file.name
                     csv_file = submission_xls_to_csv(xls_file)
                 overwrite = request.query_params.get("overwrite")
                 overwrite = (
@@ -706,10 +705,7 @@ def data_import(self, request, *args, **kwargs):
                     )
                 else:
                     csv_file.seek(0)
-                    if hasattr(csv_file, "name"):
-                        file_name = csv_file.name
-                    else:
-                        file_name = xls_file_name
+                    file_name = getattr(csv_file, "name", xls_file and xls_file.name)
                     upload_to = os.path.join(
                         request.user.username, "csv_imports", file_name
                     )