regulator: core: Release regulator-regulator supplies on error

If we fail while registering a regulator make sure we release the supply
for the regulator if there is one.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@ti.com>
Cc: stable@vger.kernel.org
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 8918271..5a33282 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -3193,6 +3193,8 @@
 	unset_regulator_supplies(rdev);
 
 scrub:
+	if (rdev->supply)
+		regulator_put(rdev->supply);
 	kfree(rdev->constraints);
 	device_unregister(&rdev->dev);
 	/* device core frees rdev */