Ruby » Ruby master

merge revision(s) 49088: [Backport #10685]

    * 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/branches/ruby_2_2@49273 b2dd03c8-39d4-4d8f-98ff-823fe69b080e