[clang] [clang-format] Add null-terminated path option (#123921) (PR #123926)

[Owen Pan via cfe-commits]

================
@@ -261,14 +267,14 @@ def main():
                 "ignored by clang-format):"
             )
             for filename in ignored_files:
-                print("    %s" % filename)
+                print_filename(filename, opts.null)
----------------
owenca wrote:

```suggestion
            print_filenames(ignored_files, opts.print0)
```
and delete line 269 above.

https://github.com/llvm/llvm-project/pull/123926