drm/nouveau: Fix memory leak in nv50_mstm_del()

Noticed this while working on redoing the reference counting scheme in the DP MST helpers. Nouveau doesn't attempt to call drm_dp_mst_topology_mgr_destroy() at all, which leaves it leaking all of the resources for drm_dp_mst_topology_mgr and it's children mstbs+ports.

---
 drivers/gpu/drm/nouveau/dispnv50/disp.c | 1 +
 1 file changed, 1 insertion(+)

index d153ea2a08ac..a634b3d0b6a1 100644
@@ -1254,6 +1254,7 @@ nv50_mstm_del(struct nv50_mstm **pmstm)
 {
 	struct nv50_mstm *mstm = *pmstm;
 	if (mstm) {
+		drm_dp_mst_topology_mgr_destroy(&mstm->mgr);
 		kfree(*pmstm);
 		*pmstm = NULL;
 	}

2.19.2

Hi,

[This is an automated email]

This commit has been processed because it contains a "Fixes:" tag,
fixing commit: f479c0ba4a17 drm/nouveau/kms/nv50: initial support for DP 1.2 multi-stream.

The bot has tested the following trees: v4.19.8, v4.14.87,

v4.19.8: Build OK!
v4.14.87: Failed to apply! Possible dependencies:
Unable to calculate

How should we proceed with this patch?

--
Thanks,
Sasha
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v4.19.8, it's ok to skip v4.14 for this

Cheers,
	Lyude Paul