test_c_bindings: Fix leaked session.
test_c_bindings: Fix leaked session.

Change-Id: Iebed8cca2a3df3ee64703a59f7e943d6dcbb09ab

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