Ruby

vm_args.c: fix non-symbol keys hash

• vm_args.c (keyword_hash_p): fix non-symbol keys hash.
  rb_extract_keywords() returns 0 not Qnil when no symbol keys is
  included.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49088 b2dd03c8-39d4-4d8f-98ff-823fe69b080e