[flang-commits] [flang] [flang] fix regression with optional after PR125059 (PR #125215)

[Tom Eccles via flang-commits]

https://github.com/tblah approved this pull request.

Thanks for the quick fix. I have one comment but feel free to merge this as it is and (possibly) follow up later if you would like to get the regression solved quickly. 

https://github.com/llvm/llvm-project/pull/125215