ASoC: tegra20_ac97: Fix missing error code in tegra20_ac97_platform_probe()

The error code is missing in this code scenario, add the error code
'-EINVAL' to the return value 'ret'.

This was found by coccicheck:

sound/soc/tegra/tegra20_ac97.c:357 tegra20_ac97_platform_probe() warn: missing error code 'ret'.
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Link: https://lore.kernel.org/r/20220701072850.62408-1-jiapeng.chong@linux.alibaba.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/tegra/tegra20_ac97.c

@@ -354,6 +354,7 @@ static int tegra20_ac97_platform_probe(struct platform_device *pdev)
 		}
 	} else {
 		dev_err(&pdev->dev, "no codec-reset GPIO supplied\n");
+		ret = -EINVAL;
 		goto err_clk_put;
 	}
 
@@ -361,6 +362,7 @@ static int tegra20_ac97_platform_probe(struct platform_device *pdev)
 					    "nvidia,codec-sync-gpio", 0);
 	if (!gpio_is_valid(ac97->sync_gpio)) {
 		dev_err(&pdev->dev, "no codec-sync GPIO supplied\n");
+		ret = -EINVAL;
 		goto err_clk_put;
 	}