visitor/unitary: remove useless boost::get

src/multibody/visitor/joint-unary-visitor.hpp

@@ -128,7 +128,7 @@ namespace pinocchio
         {
           return bf::invoke(&JointVisitorDerived::template algo<JointModelDerived>,
                             bf::make_vector(boost::ref(jmodel.derived()),
-                                            boost::ref(boost::ref(boost::get<typename JointModelBase<JointModelDerived>::JointDataDerived >(jdata)))));
+                                            boost::ref(boost::get<typename JointModelBase<JointModelDerived>::JointDataDerived >(jdata))));
         }
         
         JointData & jdata;