iio: ms65611_core: Fixes dereferencing regulator pointer

Change in handling of the regulator description means that static checkers correctly assume we could be using dereferenced pointer to the regulator. In reality we will never get the -ENODEV error, as current behavior flow does not predict it, because:
If the device tree or board file does not define suitable regulators for the component, it will be substituted by a dummy regulator, or, if regulators are disabled altogether, by stubs.

Reported-by Dan Carpenter <[email protected]>

Suggested-by Lars-Peter Clausen <[email protected]>

Signed-off-by Crt Mori <[email protected]>

---
 drivers/iio/pressure/ms5611_core.c | 19 ++++++++-----------
 1 file changed, 8 insertions(+), 11 deletions(-)

drivers/iio/pressure/ms5611_core.c +8 -11

index a74ed1f..6bd53e7 100644
@@ -392,17 +392,14 @@ static int ms5611_init(struct iio_dev *indio_dev)
 
 	/* Enable attached regulator if any. */
 	st->vdd = devm_regulator_get(indio_dev->dev.parent, "vdd");
-	if (!IS_ERR(st->vdd)) {
-		ret = regulator_enable(st->vdd);
-		if (ret) {
-			dev_err(indio_dev->dev.parent,
-				"failed to enable Vdd supply: %d\n", ret);
-			return ret;
-		}
-	} else {
-		ret = PTR_ERR(st->vdd);
-		if (ret != -ENODEV)
-			return ret;
+	if (IS_ERR(st->vdd))
+		return PTR_ERR(st->vdd);
+
+	ret = regulator_enable(st->vdd);
+	if (ret) {
+		dev_err(indio_dev->dev.parent,
+			"failed to enable Vdd supply: %d\n", ret);
+		return ret;
 	}
 
 	ret = ms5611_reset(indio_dev);