[gnome-settings-daemon] power: Simplify GVariant unref

[Bastien Nocera <hadess src gnome org>]

commit cc43329fdcbea1dcfe2bd17a7b909bb8c666548c
Author: Bastien Nocera <hadess hadess net>
Date:   Tue Apr 19 13:59:36 2016 +0200

    power: Simplify GVariant unref

 plugins/power/gsd-power-manager.c |    6 ++----
 1 files changed, 2 insertions(+), 4 deletions(-)
---
diff --git a/plugins/power/gsd-power-manager.c b/plugins/power/gsd-power-manager.c
index 5594320..5a3eb81 100644
--- a/plugins/power/gsd-power-manager.c
+++ b/plugins/power/gsd-power-manager.c
@@ -2539,10 +2539,8 @@ iio_proxy_changed (GsdPowerManager *manager)
         }
         manager->priv->ambient_percentage_old = pc;
 out:
-        if (val_has != NULL)
-                g_variant_unref (val_has);
-        if (val_als != NULL)
-                g_variant_unref (val_als);
+        g_clear_pointer (&val_has, g_variant_unref);
+        g_clear_pointer (&val_als, g_variant_unref);
 }
 
 static void