RNA: Cleanup PointerRNA struct

The old layout of `PointerRNA` was confusing for historic reasons:
```
typedef struct PointerRNA {
  struct {
    void *data;
  } id;

  struct StructRNA *type;
  void *data;
} PointerRNA;
```

This patch updates it to:
```
typedef struct PointerRNA {
  struct ID *owner_id;
  struct StructRNA *type;
  void *data;
} PointerRNA;
```

Throughout the code base `id.data` was replaced with `owner_id`.
Furthermore, many explicit pointer type casts were added which
were implicit before. Some type casts to `ID *` were removed.

Reviewers: brecht, campbellbarton

Differential Revision: https://developer.blender.org/D5558

1 files changed, 1 insertions, 1 deletions

diff --git a/source/blender/python/intern/bpy_rna_driver.c b/source/blender/python/intern/bpy_rna_driver.c
index e9e8d05aa74..a8d8252b231 100644
--- a/source/blender/python/intern/bpy_rna_driver.c
+++ b/source/blender/python/intern/bpy_rna_driver.c
@@ -91,7 +91,7 @@ bool pyrna_driver_is_equal_anim_rna(const PathResolvedRNA *anim_rna, const PyObj
     const PointerRNA *ptr_a = &anim_rna->ptr;
     const PointerRNA *ptr_b = &(((const BPy_StructRNA *)py_anim_rna)->ptr);
 
-    if ((ptr_a->id.data == ptr_b->id.data) && (ptr_a->type == ptr_b->type) &&
+    if ((ptr_a->owner_id == ptr_b->owner_id) && (ptr_a->type == ptr_b->type) &&
         (ptr_a->data == ptr_b->data)) {
       return true;
     }