staging: regulator: hi6421v600-regulator: fix some coding style issues

Fix the remaining issues complained by checkpatch.
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/af5101fa2ab1d267ac5ac22603f95c6065ac110f.1597647359.git.mchehab+huawei@kernel.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/hikey9xx/hi6421v600-regulator.c

@@ -40,7 +40,7 @@
 #include <linux/spmi.h>
 
 #define rdev_dbg(rdev, fmt, arg...)	\
-		 pr_debug("%s: %s: " fmt, rdev->desc->name, __func__, ##arg)
+		 pr_debug("%s: %s: " fmt, (rdev)->desc->name, __func__, ##arg)
 
 struct hi6421v600_regulator {
 	struct regulator_desc rdesc;
@@ -204,7 +204,8 @@ static int hi6421_spmi_regulator_set_mode(struct regulator_dev *rdev,
 	return 0;
 }
 
-static unsigned int hi6421_spmi_regulator_get_optimum_mode(struct regulator_dev *rdev,
+static unsigned int
+hi6421_spmi_regulator_get_optimum_mode(struct regulator_dev *rdev,
 				       int input_uV, int output_uV,
 				       int load_uA)
 {
@@ -404,7 +405,6 @@ static int hi6421_spmi_regulator_probe_ldo(struct platform_device *pdev,
 	return ret;
 }
 
-
 static int hi6421_spmi_regulator_probe(struct platform_device *pdev)
 {
 	struct device *pmic_dev = pdev->dev.parent;