ASoC: soc-core: remove always-false path

cppcheck throws the following warning:

sound/soc/soc-core.c:2773:6: style: Condition '!num_widgets' is always
false [knownConditionTrueFalse]
 if (!num_widgets) {
     ^

sound/soc/soc-core.c:2761:18: note: Assuming that condition
'num_widgets<0' is not redundant
 if (num_widgets < 0) {
                 ^
sound/soc/soc-core.c:2766:18: note: Assuming condition is false
 if (num_widgets & 1) {
                 ^
sound/soc/soc-core.c:2772:2: note: Compound assignment '/=', assigned
value is 0
 num_widgets /= 2;
 ^

We should check upfront all error conditions.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@intel.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Link: https://lore.kernel.org/r/20220421162505.302132-1-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: plbossart

sound/soc/soc-core.c

@@ -2763,18 +2763,18 @@ int snd_soc_of_parse_audio_simple_widgets(struct snd_soc_card *card,
 			"ASoC: Property '%s' does not exist\n",	propname);
 		return -EINVAL;
 	}
+	if (!num_widgets) {
+		dev_err(card->dev, "ASoC: Property '%s's length is zero\n",
+			propname);
+		return -EINVAL;
+	}
 	if (num_widgets & 1) {
 		dev_err(card->dev,
 			"ASoC: Property '%s' length is not even\n", propname);
 		return -EINVAL;
 	}
 
 	num_widgets /= 2;
-	if (!num_widgets) {
-		dev_err(card->dev, "ASoC: Property '%s's length is zero\n",
-			propname);
-		return -EINVAL;
-	}
 
 	widgets = devm_kcalloc(card->dev, num_widgets, sizeof(*widgets),
 			       GFP_KERNEL);