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Fix a static code checker warning:
drivers/gpu/drm/xen/xen_drm_front.c:404 xen_drm_drv_dumb_create()
warn: passing zero to 'PTR_ERR'
Signed-off-by: Ding Xiang <dingxiang@cmss.chinamobile.com>
Reviewed-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/1585562347-30214-1-git-send-email-dingxiang@cmss.chinamobile.com