drm/amdgpu: use dma_fence_chain_contained

Instead of manually extracting the fence.
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220204100429.2049-7-christian.koenig@amd.com

drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c

@@ -261,10 +261,9 @@ int amdgpu_sync_resv(struct amdgpu_device *adev, struct amdgpu_sync *sync,
 
 	dma_resv_for_each_fence(&cursor, resv, true, f) {
 		dma_fence_chain_for_each(f, f) {
-			struct dma_fence_chain *chain = to_dma_fence_chain(f);
+			struct dma_fence *tmp = dma_fence_chain_contained(f);
 
-			if (amdgpu_sync_test_fence(adev, mode, owner, chain ?
-						   chain->fence : f)) {
+			if (amdgpu_sync_test_fence(adev, mode, owner, tmp)) {
 				r = amdgpu_sync_fence(sync, f);
 				dma_fence_put(f);
 				if (r)