ASoC: au1x: dbdma2: fix oops on soc device removal.

platform_device_unregister() frees resources for us, no need to
do it explicitly.  Fixes an oops when machine code removes the
soc-audio device.
Signed-off-by: NManuel Lauss <manuel.lauss@gmail.com>
Acked-by: NLiam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/au1x/dbdma2.c

@@ -488,11 +488,8 @@ EXPORT_SYMBOL_GPL(au1xpsc_pcm_add);
 
 void au1xpsc_pcm_destroy(struct platform_device *dmapd)
 {
-	if (dmapd) {
-		kfree(dmapd->resource);
-		dmapd->resource = NULL;
+	if (dmapd)
 		platform_device_unregister(dmapd);
-	}
 }
 EXPORT_SYMBOL_GPL(au1xpsc_pcm_destroy);