Object: remove broken check on operator=
Object: remove broken check on operator=

No need to check for self assignation there since we know that o is of different
type

Change-Id: Icf7edae57b5dbcd741a998e796cff71ec5708b53
Reviewed-on: http://gerrit.aldebaran.lan/60558
Reviewed-by: vpaleologue <cb19838a79eb484e12a6960acfbf7c16dfdb80d9@aldebaran-robotics.com>
Tested-by: pdaouadi <fc1eb3334d3fdad315bae23aa166bc70bd434067@aldebaran-robotics.com>

aldebaran/libqi,aldebaran/libqi,aldebaran/libqi