Ruby » Ruby master

hash.c: fix Hash#compact! return value

• hash.c (rb_hash_compact_bang): should return nil if no elements
  is deleted. [ruby-core:77709] [Bug #12863]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56473 b2dd03c8-39d4-4d8f-98ff-823fe69b080e