Blender Git Loki

Fix T76277: Remove wrong cast in rna_NodeTree_update

This patch fixes T76277 by removing the incorrect cast from
`ptr->data` to `bNode`. The address of `ptr->owner_id` and
`ptr->data` both point to the node tree. Passing the node tree
incorrectly as a node into the `ED_node_tag_update_nodetree`
corrupts the data, because it attempts to set flags on the
node.

Reviewed By: sergey

Differential Revision: https://developer.blender.org/D7747