ASoC: Check for a CODEC before dereferencing in DAPM

A CODEC pointer is optional (and is checked for in most contexts within
DAPM) - add checks to the few places where it was missed.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>

sound/soc/soc-dapm.c

@@ -1517,7 +1517,7 @@ static int snd_soc_dapm_add_route(struct snd_soc_dapm_context *dapm,
 	char prefixed_source[80];
 	int ret = 0;
 
-	if (dapm->codec->name_prefix) {
+	if (dapm->codec && dapm->codec->name_prefix) {
 		snprintf(prefixed_sink, sizeof(prefixed_sink), "%s %s",
 			 dapm->codec->name_prefix, route->sink);
 		sink = prefixed_sink;
@@ -2167,14 +2167,14 @@ int snd_soc_dapm_new_control(struct snd_soc_dapm_context *dapm,
 		return -ENOMEM;
 
 	name_len = strlen(widget->name) + 1;
-	if (dapm->codec->name_prefix)
+	if (dapm->codec && dapm->codec->name_prefix)
 		name_len += 1 + strlen(dapm->codec->name_prefix);
 	w->name = kmalloc(name_len, GFP_KERNEL);
 	if (w->name == NULL) {
 		kfree(w);
 		return -ENOMEM;
 	}
-	if (dapm->codec->name_prefix)
+	if (dapm->codec && dapm->codec->name_prefix)
 		snprintf(w->name, name_len, "%s %s",
 			dapm->codec->name_prefix, widget->name);
 	else