drm/xe: Use dma_fence_chain_free in chain fence unused as a sync

A chain fence is uninitialized if not installed in a drm sync obj. Thus
if xe_sync_entry_cleanup is called and sync->chain_fence is non-NULL the
proper cleanup is dma_fence_chain_free rather than a dma-fence put.
Reported-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Closes: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/2411
Closes: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/2261
Fixes: dd08ebf6 ("drm/xe: Introduce a new DRM driver for Intel GPUs")
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240727012216.2118276-1-matthew.brost@intel.com

drivers/gpu/drm/xe/xe_sync.c

@@ -259,7 +259,7 @@ void xe_sync_entry_cleanup(struct xe_sync_entry *sync)
 	if (sync->fence)
 		dma_fence_put(sync->fence);
 	if (sync->chain_fence)
-		dma_fence_put(&sync->chain_fence->base);
+		dma_fence_chain_free(sync->chain_fence);
 	if (sync->ufence)
 		user_fence_put(sync->ufence);
 }