[mlir] Remove a redundant cast (NFC)#168241

kazutakahirata merged 1 commit intollvm:mainllvm/llvm-project:mainfrom

kazutakahirata:cleanup_20251115a_clang_tidy_readability-redundant-casting_mlirkazutakahirata/llvm-project:cleanup_20251115a_clang_tidy_readability-redundant-casting_mlirCopy head branch name to clipboard