[tracker] Make tracker_module_file_get_metadata() out arg more robust

[Benjamin Otte <otte src gnome org>]

commit 0b2f87e34935d57aa3b12b5ec78636648018b18d
Author: Benjamin Otte <otte gnome org>
Date:   Tue Jul 14 22:40:40 2009 +0200

    Make tracker_module_file_get_metadata() out arg more robust
    
    - Set the mime_type out argument to NULL in any case.
    - Always provide a valid mime_type pointer to called vfuncs.

 src/tracker-miner-fs/tracker-module-file.c |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)
---
diff --git a/src/tracker-miner-fs/tracker-module-file.c b/src/tracker-miner-fs/tracker-module-file.c
index 6a97b18..d8f17cd 100644
--- a/src/tracker-miner-fs/tracker-module-file.c
+++ b/src/tracker-miner-fs/tracker-module-file.c
@@ -251,12 +251,18 @@ tracker_module_file_get_text (TrackerModuleFile *file)
 TrackerSparqlBuilder *
 tracker_module_file_get_metadata (TrackerModuleFile *file, gchar **mime_type)
 {
+        gchar *tmp = NULL;
         TrackerSparqlBuilder *sparql = NULL;
 
         if (TRACKER_MODULE_FILE_GET_CLASS (file)->get_metadata != NULL) {
-                sparql = TRACKER_MODULE_FILE_GET_CLASS (file)->get_metadata (file, mime_type);
+                sparql = TRACKER_MODULE_FILE_GET_CLASS (file)->get_metadata (file, &tmp);
         }
 
+        if (mime_type)
+                *mime_type = tmp;
+        else
+                g_free (tmp);
+
         return sparql;
 }