[mlir] Remove unused local variables (NFC)#167107

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

kazutakahirata:cleanup_20251107_clang_tidy_bugprone-unused-local-non-trivial-variable_mlirkazutakahirata/llvm-project:cleanup_20251107_clang_tidy_bugprone-unused-local-non-trivial-variable_mlirCopy head branch name to clipboard