ASoC: tas2552: Fix off-by-one for max_register setting

The latest valid register is TAS2552_VBAT_DATA.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Acked-by: Dan Murphy<dmurphy@ti.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/tas2552.h

@@ -42,7 +42,7 @@
 #define TAS2552_BOOST_APT_CTRL		0x14
 #define TAS2552_VER_NUM			0x16
 #define TAS2552_VBAT_DATA		0x19
-#define TAS2552_MAX_REG			0x20
+#define TAS2552_MAX_REG			TAS2552_VBAT_DATA
 
 /* CFG1 Register Masks */
 #define TAS2552_DEV_RESET		(1 << 0)