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drm/amdgpu: fix dma_buf leak in UALink exporter cleanup
At export time the driver code always builds a dma_buf for the BO which is then shared for local imports. During cleanup, if there are no importers, which is true for local imports, we never free the dma_buf thus causing the memory leak. Fix by dropping the dma_buf reference in the no-importers branch as well. Signed-off-by: Mukul Joshi <mukul.joshi@amd.com> Reviewed-by: Harish Kasiviswanathan <Harish.Kasiviswanathan@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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