Replace deprecated g_mapped_file_free() with recommended g_mapped_file_unref()

git-svn-id: svn+ssh://svn.gnucash.org/repo/gnucash/trunk@22179 57a11ea4-9604-0410-9ed3-97b8803252fd

src/import-export/csv-import/gnc-csv-model.c

@@ -354,7 +354,9 @@ void gnc_csv_parse_data_free(GncCsvParseData* parse_data)
     /* All non-NULL pointers have been initialized and must be freed. */
 
     if (parse_data->raw_mapping != NULL)
-        g_mapped_file_free(parse_data->raw_mapping);
+    {
+        g_mapped_file_unref(parse_data->raw_mapping);
+    }
 
     if (parse_data->file_str.begin != NULL)
         g_free(parse_data->file_str.begin);