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/space_sequencer/space_sequencer.c b/source/blender/editors/space_sequencer/space_sequencer.c
index 9aa9d14cbc8..e1cf6d00b90 100644
--- a/source/blender/editors/space_sequencer/space_sequencer.c
+++ b/source/blender/editors/space_sequencer/space_sequencer.c
@@ -597,7 +597,7 @@ static void sequencer_main_region_message_subscribe(const struct bContext *UNUSE
         &RNA_SequenceModifier,
         &RNA_SequenceColorBalanceData,
     };
-    wmMsgParams_RNA msg_key_params = {{{0}}};
+    wmMsgParams_RNA msg_key_params = {{0}};
     for (int i = 0; i < ARRAY_SIZE(type_array); i++) {
       msg_key_params.ptr.type = type_array[i];
       WM_msg_subscribe_rna_params(