[MC] Remove a redundant declaration of createNullStreamer (NFC)#166025

kazutakahirata wants to merge 1 commit intollvm:mainllvm/llvm-project:mainfrom

kazutakahirata:cleanup_20251101a_clang_tidy_readability-redundant-declaration_createNullStreamerkazutakahirata/llvm-project:cleanup_20251101a_clang_tidy_readability-redundant-declaration_createNullStreamerCopy head branch name to clipboard