signal: allocate p when null (setcalltype)
signal: allocate p when null (setcalltype)

Change-Id: Ia1c7f22f48f410fe9008def32e223a217d0b5eab
Reviewed-on: http://gerrit.aldebaran.lan:8080/11131
Reviewed-by: proullon <ffff9135679d397f48dd743107119b1f6fc32d3d@aldebaran-robotics.com>
Reviewed-by: mnottale <e3ccf1b6558404e921a21fa09cebb1153b50ec36@aldebaran-robotics.com>
Tested-by: cgestes <ddb78fe00abb42f91254c16a0860e38eb0781789@aldebaran-robotics.com>

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