[tracker] Fix small memory leak

[Carlos Garnacho <carlosg src gnome org>]

commit 3dbfcd8142ac46222d539d79fa7587c0350f896a
Author: Philip Van Hoof <philip codeminded be>
Date:   Mon Jan 11 11:19:36 2016 +0100

    Fix small memory leak

 src/tracker-extract/tracker-extract-msoffice.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/src/tracker-extract/tracker-extract-msoffice.c b/src/tracker-extract/tracker-extract-msoffice.c
index c1bdbe2..5792215 100644
--- a/src/tracker-extract/tracker-extract-msoffice.c
+++ b/src/tracker-extract/tracker-extract-msoffice.c
@@ -1373,6 +1373,7 @@ xls_get_extended_record_string (GsfInput  *stream,
                /* Go to next chunk */
                i++;
        }
+       g_free(buffer);
 }
 
 /**