dma-buf: Remove unneeded sanity checks
ops, ops->map_dma_buf and ops->unmap_dma_buf are guaranteed to be non-NULL by a check in dma_buf_export(). Remove NULL checks on those variables in the other API functions. Signed-off-by: NLaurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: NDaniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by: NSumit Semwal <sumit.semwal@linaro.org>
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