drm/msm: fix potential NULL dereference in cleanup

The "msm_obj->node" list needs to be initialized earlier so that the
list_del() in msm_gem_free_object() doesn't experience a NULL pointer
dereference.

Fixes: 6ed0897c ("drm/msm: Fix debugfs deadlock")
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/r/20211013081133.GF6010@kiliSigned-off-by: NRob Clark <robdclark@chromium.org>

drivers/gpu/drm/msm/msm_gem.c

@@ -1132,6 +1132,7 @@ static int msm_gem_new_impl(struct drm_device *dev,
 	msm_obj->flags = flags;
 	msm_obj->madv = MSM_MADV_WILLNEED;
 
+	INIT_LIST_HEAD(&msm_obj->node);
 	INIT_LIST_HEAD(&msm_obj->vmas);
 
 	*obj = &msm_obj->base;