ASoC: sti: sti_uniperif: add missing error check

cppcheck warning:

sound/soc/sti/sti_uniperif.c:490:6: style: Variable 'ret' is
reassigned a value before the old one has been
used. [redundantAssignment]
 ret = devm_snd_soc_register_component(&pdev->dev,
     ^
sound/soc/sti/sti_uniperif.c:486:6: note: ret is assigned
 ret = sti_uniperiph_cpu_dai_of(node, priv);
     ^
sound/soc/sti/sti_uniperif.c:490:6: note: ret is overwritten
 ret = devm_snd_soc_register_component(&pdev->dev,
     ^

sti_uniperiph_cpu_dai_of() can return -EINVAL which seems like a
good-enough reason to bail.
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Arnaud Pouliquen <arnaud.pouliquen@st.com>
Link: https://lore.kernel.org/r/20210326215927.936377-9-pierre-louis.bossart@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sti/sti_uniperif.c

@@ -484,6 +484,8 @@ static int sti_uniperiph_probe(struct platform_device *pdev)
 	priv->pdev = pdev;
 
 	ret = sti_uniperiph_cpu_dai_of(node, priv);
+	if (ret < 0)
+		return ret;
 
 	dev_set_drvdata(&pdev->dev, priv);