* gc.c (gc_page_sweep): Fix compile warning from last commit.
* hash.c (hash_aset_str): Re-use existing variable to avoid
  unnecessary pointer dereferencing.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43876 b2dd03c8-39d4-4d8f-98ff-823fe69b080e