[tracker] libtracker-data: Protect potential NULL dereference in _db_cursor_iter_next()

[Martyn James Russell <mr src gnome org>]

commit 8bfbde8ab65b52131db80ed3f391e50cce0899de
Author: Martyn Russell <martyn lanedo com>
Date:   Thu Mar 6 20:23:51 2014 +0000

    libtracker-data: Protect potential NULL dereference in _db_cursor_iter_next()

 src/libtracker-data/tracker-db-interface-sqlite.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/src/libtracker-data/tracker-db-interface-sqlite.c 
b/src/libtracker-data/tracker-db-interface-sqlite.c
index 7c121fc..2610120 100644
--- a/src/libtracker-data/tracker-db-interface-sqlite.c
+++ b/src/libtracker-data/tracker-db-interface-sqlite.c
@@ -2096,6 +2096,10 @@ tracker_db_cursor_iter_next (TrackerDBCursor *cursor,
                              GCancellable    *cancellable,
                              GError         **error)
 {
+       if (!cursor) {
+               return FALSE;
+       }
+
        return db_cursor_iter_next (cursor, cancellable, error);
 }