regulator: pfuze100: unsigned compared against 0

Fix unsigned compared against 0.
Signed-off-by: NPeng Fan <peng.fan@nxp.com>
Cc: Jaehoon Chung <jh80.chung@samsung.com>
Reviewed-by: NJaehoon Chung <jh80.chung@samsung.com>

drivers/power/regulator/pfuze100.c

@@ -314,7 +314,7 @@ static int pfuze100_regulator_probe(struct udevice *dev)
 
 static int pfuze100_regulator_mode(struct udevice *dev, int op, int *opmode)
 {
-	unsigned char val;
+	int val;
 	struct pfuze100_regulator_platdata *plat = dev_get_platdata(dev);
 	struct pfuze100_regulator_desc *desc = plat->desc;
 
@@ -384,7 +384,7 @@ static int pfuze100_regulator_mode(struct udevice *dev, int op, int *opmode)
 
 static int pfuze100_regulator_enable(struct udevice *dev, int op, bool *enable)
 {
-	unsigned char val;
+	int val;
 	int ret, on_off;
 	struct dm_regulator_uclass_platdata *uc_pdata =
 		dev_get_uclass_platdata(dev);
@@ -448,7 +448,7 @@ static int pfuze100_regulator_enable(struct udevice *dev, int op, bool *enable)
 static int pfuze100_regulator_val(struct udevice *dev, int op, int *uV)
 {
 	int i;
-	unsigned char val;
+	int val;
 	struct pfuze100_regulator_platdata *plat = dev_get_platdata(dev);
 	struct pfuze100_regulator_desc *desc = plat->desc;
 	struct dm_regulator_uclass_platdata *uc_pdata =