drm/amdgpu: Add put fence in amdgpu_fence_driver_clear_job_fences

This function should drop the fence refcount when it extracts the
fence from the fence array, just as it's done in amdgpu_fence_process.
Signed-off-by: NAndrey Grodzovsky <andrey.grodzovsky@amd.com>
Reviewed-by: NChristian König <christian.koenig@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

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

@@ -595,8 +595,10 @@ void amdgpu_fence_driver_clear_job_fences(struct amdgpu_ring *ring)
 	for (i = 0; i <= ring->fence_drv.num_fences_mask; i++) {
 		ptr = &ring->fence_drv.fences[i];
 		old = rcu_dereference_protected(*ptr, 1);
-		if (old && old->ops == &amdgpu_job_fence_ops)
+		if (old && old->ops == &amdgpu_job_fence_ops) {
 			RCU_INIT_POINTER(*ptr, NULL);
+			dma_fence_put(old);
+		}
 	}
 }