ASoC: wm8900: fix a memory leak if wm8900_set_fll fails

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/sound/soc/codecs/wm8900.c b/sound/soc/codecs/wm8900.c
index 449ea09..082040e 100644
--- a/sound/soc/codecs/wm8900.c
+++ b/sound/soc/codecs/wm8900.c
@@ -1167,6 +1167,7 @@
 		ret = wm8900_set_fll(codec, 0, fll_in, fll_out);
 		if (ret != 0) {
 			dev_err(codec->dev, "Failed to restart FLL\n");
+			kfree(cache);
 			return ret;
 		}
 	}