thermal: rcar: add rcar_zone_to_priv() macro

This patch adds rcar_zone_to_priv()
which is a helper macro for gettign private data.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
diff --git a/drivers/thermal/rcar_thermal.c b/drivers/thermal/rcar_thermal.c
index f2678ff..90db951 100644
--- a/drivers/thermal/rcar_thermal.c
+++ b/drivers/thermal/rcar_thermal.c
@@ -44,6 +44,7 @@
 };
 
 #define MCELSIUS(temp)			((temp) * 1000)
+#define rcar_zone_to_priv(zone)		(zone->devdata)
 
 /*
  *		basic functions
@@ -98,7 +99,7 @@
 static int rcar_thermal_get_temp(struct thermal_zone_device *zone,
 			   unsigned long *temp)
 {
-	struct rcar_thermal_priv *priv = zone->devdata;
+	struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone);
 	int val, min, max, tmp;
 
 	tmp = -200; /* default */