regulator: core: Fix checkpatch issue

Fix the following checkpatch errors and warnings.

  ERROR: trailing whitespace
  ERROR: return is not a function, parentheses are not required
  WARNING: braces {} are not necessary for single statement blocks
Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

drivers/regulator/core.c

@@ -1334,9 +1334,8 @@ static struct regulator *_regulator_get(struct device *dev, const char *id,
 	 * If we have return value from dev_lookup fail, we do not expect to
 	 * succeed, so, quit with appropriate error value
 	 */
-	if (ret && ret != -ENODEV) {
+	if (ret && ret != -ENODEV)
 		goto out;
-	}
 
 	if (!devname)
 		devname = "deviceless";
@@ -2245,7 +2244,7 @@ int regulator_is_supported_voltage(struct regulator *regulator,
 	if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
 		ret = regulator_get_voltage(regulator);
 		if (ret >= 0)
-			return (min_uV <= ret && ret <= max_uV);
+			return min_uV <= ret && ret <= max_uV;
 		else
 			return ret;
 	}
@@ -3836,9 +3835,8 @@ static int __init regulator_init_complete(void)
 			 * goes wrong. */
 			rdev_info(rdev, "disabling\n");
 			ret = ops->disable(rdev);
-			if (ret != 0) {
+			if (ret != 0)
 				rdev_err(rdev, "couldn't disable: %d\n", ret);
-			}
 		} else {
 			/* The intention is that in future we will
 			 * assume that full constraints are provided