regulator: missing index in PTR_ERR() in isl6271a_probe()

The index is missing so the return is wrong.

Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
diff --git a/drivers/regulator/isl6271a-regulator.c b/drivers/regulator/isl6271a-regulator.c
index b5639e8..e4b3592 100644
--- a/drivers/regulator/isl6271a-regulator.c
+++ b/drivers/regulator/isl6271a-regulator.c
@@ -173,7 +173,7 @@
 						init_data, pmic);
 		if (IS_ERR(pmic->rdev[i])) {
 			dev_err(&i2c->dev, "failed to register %s\n", id->name);
-			err = PTR_ERR(pmic->rdev);
+			err = PTR_ERR(pmic->rdev[i]);
 			goto error;
 		}
 	}