[epiphany] Fix ephy_bookmarks_manager_save_sync()

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 5ec1d92a000036c5fd00bbca2a0ca8120a057b09
Author: Michael Catanzaro <mcatanzaro igalia com>
Date:   Thu Jun 27 17:41:59 2019 -0500

    Fix ephy_bookmarks_manager_save_sync()
    
    This is causing crashes on startup when running with -p, because we do a
    sync save of the bookmarks file if it doesn't already exist when
    creating the bookmarks manager.

 src/bookmarks/ephy-bookmarks-manager.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/src/bookmarks/ephy-bookmarks-manager.c b/src/bookmarks/ephy-bookmarks-manager.c
index f44a4a9c3..f7148a879 100644
--- a/src/bookmarks/ephy-bookmarks-manager.c
+++ b/src/bookmarks/ephy-bookmarks-manager.c
@@ -681,7 +681,7 @@ ephy_bookmarks_manager_save_sync (EphyBookmarksManager  *self,
   gboolean result;
 
   context = g_main_context_new ();
-  data = g_new (SaveToFileData, 1);
+  data = g_new0 (SaveToFileData, 1);
   data->main_loop = g_main_loop_new (context, FALSE);
 
   g_main_context_push_thread_default (context);
@@ -690,7 +690,8 @@ ephy_bookmarks_manager_save_sync (EphyBookmarksManager  *self,
   g_main_context_pop_thread_default (context);
 
   result = data->result;
-  g_propagate_error (error, data->error);
+  if (data->error)
+    g_propagate_error (error, data->error);
 
   g_main_loop_unref (data->main_loop);
   g_free (data);