[tracker] Fix uninitialized variable in libav extractor.

[Philip Van Hoof <pvanhoof src gnome org>]

commit 16a76332cf271398717a4fa8a63f1e07203f455a
Author: Andrew den Exter <andrew den exter jollamobile com>
Date:   Fri Sep 13 03:09:51 2013 +0000

    Fix uninitialized variable in libav extractor.
    
    And warning about passing NULL to an argument that takes an int in
    vorbis extractor.

 src/tracker-extract/tracker-extract-libav.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/tracker-extract/tracker-extract-libav.c b/src/tracker-extract/tracker-extract-libav.c
index 04ed3a0..1414b5d 100644
--- a/src/tracker-extract/tracker-extract-libav.c
+++ b/src/tracker-extract/tracker-extract-libav.c
@@ -125,7 +125,7 @@ tracker_extract_get_metadata (TrackerExtractInfo *info)
        AVStream *video_stream = NULL;
        int streamIndex;
        AVDictionaryEntry *tag = NULL;
-       const char *title;
+       const char *title = NULL;
 
        av_register_all();