ASoC: Fix multi-componentism

Spot the build testing.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/sound/soc/soc-cache.c b/sound/soc/soc-cache.c
index 15d2779..f6b0d28 100644
--- a/sound/soc/soc-cache.c
+++ b/sound/soc/soc-cache.c
@@ -204,7 +204,7 @@
 	data[2] = value & 0xff;
 
 	if (!snd_soc_codec_volatile_register(codec, reg)
-		&& reg < codec->driver->reg_cache_size)
+		&& reg < codec->reg_cache_size)
 			reg_cache[reg] = value;
 
 	if (codec->cache_only) {