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[ Upstream commitfb18fe0fdf] mipi_dsi_device_register_full() never returns NULL pointer, it will return ERR_PTR() when it fails, so replace the check with IS_ERR(). Fixes:0993234a00("drm/panel: Add driver for Novatek NT36523") Signed-off-by: Yang Yingliang <yangyingliang@huawei.com> Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org> Link: https://lore.kernel.org/r/20231129090715.856263-1-yangyingliang@huaweicloud.com Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org> Link: https://patchwork.freedesktop.org/patch/msgid/20231129090715.856263-1-yangyingliang@huaweicloud.com Signed-off-by: Sasha Levin <sashal@kernel.org>