Signature: fix segfault
Signature: fix segfault

Change-Id: Ic1ce0b0475f0c69963ce4bc7bea3f055d976d299
Reviewed-on: http://gerrit.aldebaran.lan/37125
Reviewed-by: pdaouadi <fc1eb3334d3fdad315bae23aa166bc70bd434067@aldebaran-robotics.com>
Tested-by: pdaouadi <fc1eb3334d3fdad315bae23aa166bc70bd434067@aldebaran-robotics.com>

bsautron/libqi,vbarbaresi/libqi,aldebaran/libqi,aldebaran/libqi,aldebaran/libqi