[tracker] tracker-extract: Plug error leak

[Carlos Garnacho <carlosg src gnome org>]

commit 731ae253ba5404c97f81b0f61e12e7672afc1022
Author: Carlos Garnacho <carlosg gnome org>
Date:   Thu Aug 6 01:09:48 2015 +0200

    tracker-extract: Plug error leak

 src/tracker-extract/tracker-extract-decorator.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/src/tracker-extract/tracker-extract-decorator.c b/src/tracker-extract/tracker-extract-decorator.c
index 9152e4e..a3c8a31 100644
--- a/src/tracker-extract/tracker-extract-decorator.c
+++ b/src/tracker-extract/tracker-extract-decorator.c
@@ -224,8 +224,9 @@ get_metadata_cb (TrackerExtract *extract,
                g_simple_async_result_propagate_error (G_SIMPLE_ASYNC_RESULT (result), &error);
 
                if (!error || error->domain == TRACKER_EXTRACT_ERROR) {
-                       g_message ("Extraction failed: %s\n", error->message);
+                       g_message ("Extraction failed: %s\n", error ? error->message : "no error given");
                        g_task_return_boolean (task, FALSE);
+                       g_clear_error (&error);
                } else {
                        g_task_return_error (task, error);
                }