regulator: Remove NULL test before calling regulator_unregister()

It's safe to call regulator_unregister() with NULL, thus remove the NULL test
before regulator_unregister() calls.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Mark Brown <broonie@sirena.org.uk>
diff --git a/drivers/regulator/tps6524x-regulator.c b/drivers/regulator/tps6524x-regulator.c
index 843ee0a..06e9276 100644
--- a/drivers/regulator/tps6524x-regulator.c
+++ b/drivers/regulator/tps6524x-regulator.c
@@ -584,8 +584,7 @@
 	if (!hw)
 		return 0;
 	for (i = 0; i < N_REGULATORS; i++) {
-		if (hw->rdev[i])
-			regulator_unregister(hw->rdev[i]);
+		regulator_unregister(hw->rdev[i]);
 		hw->rdev[i] = NULL;
 	}
 	spi_set_drvdata(spi, NULL);