Adding default vcard for new created DB always failed with seg fault, as
file_db was not initialized before access. This patch fix it.

Signed-off-by: Edwin Zhai <edwin.zhai@intel.com>
Index: evolution-data-server/addressbook/backends/file/e-book-backend-file.c
===================================================================
--- evolution-data-server.orig/addressbook/backends/file/e-book-backend-file.c	2011-04-26 15:46:03.000000000 +0800
+++ evolution-data-server/addressbook/backends/file/e-book-backend-file.c	2011-04-26 15:59:13.000000000 +0800
@@ -1247,6 +1247,8 @@
 #ifdef CREATE_DEFAULT_VCARD
 				EContact *contact = NULL;
 
+				/* Initialize file_db, or else following do_create cause seg fault */
+				bf->priv->file_db = db;
 				if (!do_create (bf, XIMIAN_VCARD, &contact, NULL))
 					g_warning ("Cannot create default contact");
 				if (contact)
