qiclient: fix a memleak
qiclient: fix a memleak

Change-Id: Ied63f9a20bea5f2c89229b33f66af02b17a33e31
Reviewed-on: http://gerrit.aldebaran.lan:8080/4782
Reviewed-by: llec <42f1a1c02cacc0f5b0188f0127ea77bedfdcf21a@aldebaran-robotics.com>
Tested-by: cgestes <ddb78fe00abb42f91254c16a0860e38eb0781789@aldebaran-robotics.com>

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