ASoC: DAPM: Allow multiple mixer sources to be routed via the same switch

Currently it is only possible to route one source per switch into a mixer.
This patch modifies the code, so that it is possible to route multiple sources
into a mixer via the same switch. One use-case for this is routing a stereo
channel pair into a mono-mixer via the same switch.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/soc-dapm.c

@@ -443,6 +443,11 @@ static int dapm_new_mixer(struct snd_soc_dapm_widget *w)
 			if (path->name != (char *)w->kcontrol_news[i].name)
 				continue;
 
+			if (w->kcontrols[i]) {
+				path->kcontrol = w->kcontrols[i];
+				continue;
+			}
+
 			wlistsize = sizeof(struct snd_soc_dapm_widget_list) +
 				    sizeof(struct snd_soc_dapm_widget *),
 			wlist = kzalloc(wlistsize, GFP_KERNEL);
@@ -1556,7 +1561,6 @@ static int dapm_mixer_update_power(struct snd_soc_dapm_widget *widget,
 		/* found, now check type */
 		found = 1;
 		path->connect = connect;
-		break;
 	}
 
 	if (found)