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Avoid dereferencing struct drm_gem_object.import_attach for the imported dma-buf. The dma_buf field in the GEM object instance refers to the same buffer. Prepares to make import_attach optional. Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Reviewed-by: Anusha Srivatsa <asrivats@redhat.com> Reviewed-by: Christian König <christian.koenig@amd.com> Link: https://patchwork.freedesktop.org/patch/msgid/20250226172457.217725-6-tzimmermann@suse.de