ASoC: dapm: Drop always true checks

list_first_entry() always returns non NULL and since the code previously
checked that list is not empty it will also be a valid pointer. Furthermore
a path has always a sink or a source widget. So both checks are redundant
and can be removed.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/soc-dapm.c

@@ -3482,11 +3482,6 @@ static int snd_soc_dai_link_event(struct snd_soc_dapm_widget *w,
 	sink_p = list_first_entry(&w->sinks, struct snd_soc_dapm_path,
 				  list_source);
 
-	if (WARN_ON(!source_p || !sink_p) ||
-	    WARN_ON(!sink_p->source || !source_p->sink) ||
-	    WARN_ON(!source_p->source || !sink_p->sink))
-		return -EINVAL;
-
 	source = source_p->source->priv;
 	sink = sink_p->sink->priv;