ASoC: imx-hdmi: Fix warning of the uninitialized variable ret

ASoC: imx-hdmi: Fix warning of the uninitialized variable ret

When condition ((hdmi_out && hdmi_in) || (!hdmi_out && !hdmi_in))
is true, then goto fail, the uninitialized variable ret will be
returned.

Signed-off-by: shengjiu wang <shengjiu.wang@nxp.com>
Reported-by: kernel test robot <lkp@intel.com>
Acked-by: Nicolin Chen <nicoleotsuka@gmail.com>
Fixes: 6a5f850aa83a ("ASoC: fsl: Add imx-hdmi machine driver")
Reviewed-by: Fabio Estevam <festevam@gmail.com>
Link: https://lore.kernel.org/r/1608115464-18710-1-git-send-email-shengjiu.wang@nxp.com
Signed-off-by: Mark Brown <broonie@kernel.org>