[nautilus] Update gnome-desktop code

[Ernestas Kulik <ernestask src gnome org>]

commit caeebd69f644366e932516f61d3989ff53dee152
Author: Ernestas Kulik <ekulik redhat com>
Date:   Sun Apr 14 10:40:12 2019 +0200

    Update gnome-desktop code

 src/gnome-desktop/gnome-desktop-thumbnail-script.c | 6 +++++-
 src/gnome-desktop/gnome-desktop-thumbnail.c        | 6 ++++--
 2 files changed, 9 insertions(+), 3 deletions(-)
---
diff --git a/src/gnome-desktop/gnome-desktop-thumbnail-script.c 
b/src/gnome-desktop/gnome-desktop-thumbnail-script.c
index 525766388..8e8b87653 100644
--- a/src/gnome-desktop/gnome-desktop-thumbnail-script.c
+++ b/src/gnome-desktop/gnome-desktop-thumbnail-script.c
@@ -343,7 +343,7 @@ setup_seccomp (GPtrArray  *argv_array,
     {SCMP_SYS (clone), &SCMP_A0 (SCMP_CMP_MASKED_EQ, CLONE_NEWUSER, CLONE_NEWUSER)},
 
     /* Don't allow faking input to the controlling tty (CVE-2017-5226) */
-    {SCMP_SYS (ioctl), &SCMP_A1(SCMP_CMP_EQ, (int)TIOCSTI)},
+    {SCMP_SYS (ioctl), &SCMP_A1(SCMP_CMP_MASKED_EQ, 0xFFFFFFFFu, (int)TIOCSTI)},
   };
 
   struct
@@ -565,6 +565,10 @@ add_bwrap (GPtrArray   *array,
         }
     }
 
+  /* fontconfig cache if necessary */
+  if (!g_str_has_prefix (FONTCONFIG_CACHE_PATH, "/usr/"))
+    add_args (array, "--ro-bind-try", FONTCONFIG_CACHE_PATH, FONTCONFIG_CACHE_PATH, NULL);
+
   add_args (array,
            "--proc", "/proc",
            "--dev", "/dev",
diff --git a/src/gnome-desktop/gnome-desktop-thumbnail.c b/src/gnome-desktop/gnome-desktop-thumbnail.c
index f48fd461a..566fbeb84 100644
--- a/src/gnome-desktop/gnome-desktop-thumbnail.c
+++ b/src/gnome-desktop/gnome-desktop-thumbnail.c
@@ -967,8 +967,10 @@ get_preview_thumbnail (const char *uri,
     if (file_info == NULL)
       return NULL;
 
-    object = g_object_ref (g_file_info_get_attribute_object (file_info,
-                                                             G_FILE_ATTRIBUTE_PREVIEW_ICON));
+    object = g_file_info_get_attribute_object (file_info,
+                                               G_FILE_ATTRIBUTE_PREVIEW_ICON);
+    if (object)
+        g_object_ref (object);
     g_object_unref (file_info);
 
     if (!object)