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The screen_base field comes from the fbdev BO and contains the fbdev framebuffer base address. We get the BO memory via radeon_bo_kmap(), which already reports the error -ENOMEM if the buffer could not be mapped. So remove the later test for screen_base, which will never be NULL at this point. Reviewed-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>