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/s5m8767.c b/drivers/regulator/s5m8767.c
index 8a83194..2dd74e2 100644
--- a/drivers/regulator/s5m8767.c
+++ b/drivers/regulator/s5m8767.c
@@ -923,8 +923,7 @@
 	return 0;
 err:
 	for (i = 0; i < s5m8767->num_regulators; i++)
-		if (rdev[i])
-			regulator_unregister(rdev[i]);
+		regulator_unregister(rdev[i]);
 
 	return ret;
 }
@@ -936,8 +935,7 @@
 	int i;
 
 	for (i = 0; i < s5m8767->num_regulators; i++)
-		if (rdev[i])
-			regulator_unregister(rdev[i]);
+		regulator_unregister(rdev[i]);
 
 	return 0;
 }