Fix memory leak.
Fix memory leak.

zoo_get_children() returns allocated memory implicity.

mathn/jubatus,gintenlabo/jubatus,jubatus/jubatus,jubatus/jubatus,jubatus/jubatus,elkingtonmcb/jubatus,roselleebarle04/jubatus,gintenlabo/jubatus,rimms/jubatus,rimms/jubatus,elkingtonmcb/jubatus,roselleebarle04/jubatus,mathn/jubatus