[gnome-photos] utils: Use g_auto for consistency

[Debarshi Ray <debarshir src gnome org>]

commit f9bf40262ae4b774dd7422c2a2ff2a8bfd6c1709
Author: Debarshi Ray <debarshir gnome org>
Date:   Wed Dec 13 14:12:45 2017 +0100

    utils: Use g_auto for consistency

 src/photos-utils.c |    4 +---
 1 files changed, 1 insertions(+), 3 deletions(-)
---
diff --git a/src/photos-utils.c b/src/photos-utils.c
index 82a2b7e..fb0cf2d 100644
--- a/src/photos-utils.c
+++ b/src/photos-utils.c
@@ -393,14 +393,12 @@ photos_utils_create_zoom_target_value (gdouble delta, PhotosZoomEvent event)
   GVariant *delta_value;
   GVariant *event_nick_value;
   GVariant *ret_val = NULL;
-  GVariantBuilder builder;
+  g_auto (GVariantBuilder) builder = G_VARIANT_BUILDER_INIT (G_VARIANT_TYPE_VARDICT);
   const gchar *event_nick = "none";
 
   g_return_val_if_fail (delta >= 0.0, NULL);
   g_return_val_if_fail (event != PHOTOS_ZOOM_EVENT_NONE, NULL);
 
-  g_variant_builder_init (&builder, G_VARIANT_TYPE_VARDICT);
-
   delta_value = g_variant_new_double (delta);
   g_variant_builder_add (&builder, "{sv}", "delta", delta_value);