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/max8649.c b/drivers/regulator/max8649.c
index 3ca1438..f444270 100644
--- a/drivers/regulator/max8649.c
+++ b/drivers/regulator/max8649.c
@@ -275,10 +275,8 @@
 {
 	struct max8649_regulator_info *info = i2c_get_clientdata(client);
 
-	if (info) {
-		if (info->regulator)
-			regulator_unregister(info->regulator);
-	}
+	if (info)
+		regulator_unregister(info->regulator);
 
 	return 0;
 }