drm/amdgpu/si_dma: remove unused variable in si_dma_stop()
After commit 571c0536 ("drm/amdgpu: switch sdma buffer function tear down to a helper"), the variable 'ring' is not used anymore, it can be removed. Signed-off-by:Yang Yingliang <yangyingliang@huawei.com> Signed-off-by:
Alex Deucher <alexander.deucher@amd.com>
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