ASoC: dapm: Do not add un-muxed paths to MUX control

Paths that are directly connected to a MUX widget are not affected by
changes to the MUX's control. Rather than checking if a path is directly
connected each time the MUX is updated do it only once when MUX is created.

We can also remove the check for e->texts[mux] != NULL, since if that
condition was true the code would have had already crashed much earlier (And
generally speaking if a enum's 'texts' entry is NULL it's a bug in the
driver).
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/soc-dapm.c

@@ -738,8 +738,10 @@ static int dapm_new_mux(struct snd_soc_dapm_widget *w)
 	if (ret < 0)
 		return ret;
 
-	list_for_each_entry(path, &w->sources, list_sink)
+	list_for_each_entry(path, &w->sources, list_sink) {
+		if (path->name)
 			dapm_kcontrol_add_path(w->kcontrols[0], path);
+	}
 
 	return 0;
 }
@@ -1955,9 +1957,6 @@ static int soc_dapm_mux_update_power(struct snd_soc_card *card,
 
 	/* find dapm widget path assoc with kcontrol */
 	dapm_kcontrol_for_each_path(path, kcontrol) {
-		if (!path->name || !e->texts[mux])
-			continue;
-
 		found = 1;
 		/* we now need to match the string in the enum to the path */
 		if (!(strcmp(path->name, e->texts[mux])))