thermal: rcar: use parenthesis on macro

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 89979ff..47b2b22 100644
--- a/drivers/thermal/rcar_thermal.c
+++ b/drivers/thermal/rcar_thermal.c
@@ -47,7 +47,7 @@
 };
 
 #define MCELSIUS(temp)			((temp) * 1000)
-#define rcar_zone_to_priv(zone)		(zone->devdata)
+#define rcar_zone_to_priv(zone)		((zone)->devdata)
 
 /*
  *		basic functions