[multibody] [model] [getBodyId] Fix return type

src/multibody/model.hpp

@@ -442,7 +442,7 @@ namespace pinocchio
     ///
     /// \return Index of the body.
     ///
-    JointIndex getBodyId(const std::string & name) const;
+    FrameIndex getBodyId(const std::string & name) const;
     
     ///
     /// \brief Check if a body given by its name exists.

src/multibody/model.hxx

@@ -194,7 +194,7 @@ namespace pinocchio
   }
   
   template<typename Scalar, int Options, template<typename,int> class JointCollectionTpl>
-  inline typename ModelTpl<Scalar,Options,JointCollectionTpl>::JointIndex
+  inline typename ModelTpl<Scalar,Options,JointCollectionTpl>::FrameIndex
   ModelTpl<Scalar,Options,JointCollectionTpl>::
   getBodyId(const std::string & name) const
   {