[gtk+] Plug a memory leak

[Matthias Clasen <matthiasc src gnome org>]

commit 407d3db2b6a8ef34ad8436e9a0f9c02e08ca91ae
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu Jan 4 22:54:29 2018 -0500

    Plug a memory leak
    
    gdk_pixbuf_format_get_name returns newly allocated
    strings.

 gdk/gdkcontentserializer.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/gdk/gdkcontentserializer.c b/gdk/gdkcontentserializer.c
index f9fac88..843c613 100644
--- a/gdk/gdkcontentserializer.c
+++ b/gdk/gdkcontentserializer.c
@@ -850,12 +850,12 @@ init (void)
           gdk_content_register_serializer (GDK_TYPE_TEXTURE,
                                            *m,
                                            pixbuf_serializer,
-                                           g_strdup (gdk_pixbuf_format_get_name (fmt)),
+                                           gdk_pixbuf_format_get_name (fmt),
                                            g_free);
           gdk_content_register_serializer (GDK_TYPE_PIXBUF,
                                            *m,
                                            pixbuf_serializer,
-                                           g_strdup (gdk_pixbuf_format_get_name (fmt)),
+                                           gdk_pixbuf_format_get_name (fmt),
                                            g_free);
        }
       g_strfreev (mimes);