ASoC: wm_adsp: Fix support for firmware switching on DSP2 and higher

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/sound/soc/codecs/wm_adsp.c b/sound/soc/codecs/wm_adsp.c
index f3a9b55..5487a94 100644
--- a/sound/soc/codecs/wm_adsp.c
+++ b/sound/soc/codecs/wm_adsp.c
@@ -196,7 +196,7 @@
 	if (adsp[e->shift_l].running)
 		return -EBUSY;
 
-	adsp->fw = ucontrol->value.integer.value[0];
+	adsp[e->shift_l].fw = ucontrol->value.integer.value[0];
 
 	return 0;
 }