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/editors/armature/pose_select.c b/source/blender/editors/armature/pose_select.c
index beec2f8358f..a59067e60c1 100644
--- a/source/blender/editors/armature/pose_select.c
+++ b/source/blender/editors/armature/pose_select.c
@@ -807,7 +807,7 @@ static bool pose_select_same_group(bContext *C, bool extend)
   group_flags = NULL;
   ob_index = -1;
   ob_prev = NULL;
-  CTX_DATA_BEGIN_WITH_ID (C, bPoseChannel *, pchan, visible_pose_bones, Object, *ob) {
+  CTX_DATA_BEGIN_WITH_ID (C, bPoseChannel *, pchan, visible_pose_bones, Object *, ob) {
     if (ob != ob_prev) {
       ob_index++;
       group_flags = group_flags_array + (ob_index * groups_len);