fix typos

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44249 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
hash.c: typo

* hash.c (rb_hash_reject): fix typo in macro name.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44250 b2dd03c8-39d4-4d8f-98ff-823fe69b080e