ASoC: topology: Fix error return code in soc_tplg_dapm_widget_create()

Fix to return error code -ENOMEM instead of 0 when failed to create
widget, as done elsewhere in this function.

Fixes: 8a9782346d ("ASoC: topology: Add topology core")
Signed-off-by: Wei Yongjun <weiyj.lk@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/soc-topology.c

@@ -1476,6 +1476,7 @@ widget:
 	if (widget == NULL) {
 		dev_err(tplg->dev, "ASoC: failed to create widget %s controls\n",
 			w->name);
+		ret = -ENOMEM;
 		goto hdr_err;
 	}