From reading the code it looks like at some point the code was expecting
the `tptr` PointerRNA to change during the loop? But currently it did
not make any sense to have this complex looping and multi-checking of
RNA path and animdata, since the RNA pointer (and therefore its
`owner_id`) is never modified...
NOTE: there could be much more cleanup done in that area, goal of this
commit is mainly to simplify the logic by removing all the (seamingly)
dead code.
Differential Revision: https://developer.blender.org/D15026
878a805ae8