regulator: core: don't disable regulator if is_enabled return error.

In regulator_late_cleanup when is_enabled failed, don't try to disable
the regulator since it would likely to fail too and causing confusing
error messages.
Signed-off-by: NPi-Hsun Shih <pihsun@chromium.org>
Link: https://lore.kernel.org/r/20201106064817.3290927-1-pihsun@chromium.orgSigned-off-by: NMark Brown <broonie@kernel.org>

drivers/regulator/core.c

@@ -5843,13 +5843,14 @@ static int regulator_late_cleanup(struct device *dev, void *data)
 	if (rdev->use_count)
 		goto unlock;
 
-	/* If we can't read the status assume it's on. */
+	/* If we can't read the status assume it's always on. */
 	if (ops->is_enabled)
 		enabled = ops->is_enabled(rdev);
 	else
 		enabled = 1;
 
-	if (!enabled)
+	/* But if reading the status failed, assume that it's off. */
+	if (enabled <= 0)
 		goto unlock;
 
 	if (have_full_constraints()) {