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[ Upstream commit81a206d736] If device_link_add() fails, it returns NULL pointer not ERR_PTR(), replace IS_ERR() with NULL pointer check, and return -EINVAL. Fixes:d3a0946d7a("clk: imx: imx8: add audio clock mux driver") Signed-off-by: Yang Yingliang <yangyingliang@huawei.com> Reviewed-by: Peng Fan <peng.fan@nxp.com> Reviewed-by: Abel Vesa <abel.vesa@linaro.org> Link: https://lore.kernel.org/r/20241026112452.1523-1-yangyingliang@huaweicloud.com Signed-off-by: Abel Vesa <abel.vesa@linaro.org> Signed-off-by: Sasha Levin <sashal@kernel.org>