test_c_future: fix a leak
test_c_future: fix a leak

Change-Id: Ic7ca25a655b6deb0b335aa5eb0efa74bccc41f96
Reviewed-on: http://gerrit.aldebaran.lan:8080/16093
Reviewed-by: cgestes <ddb78fe00abb42f91254c16a0860e38eb0781789@aldebaran-robotics.com>
Tested-by: cgestes <ddb78fe00abb42f91254c16a0860e38eb0781789@aldebaran-robotics.com>

aldebaran/libqi-java,aldebaran/libqi,vbarbaresi/libqi,aldebaran/libqi-java,bsautron/libqi,aldebaran/libqi-java,aldebaran/libqi,aldebaran/libqi