[tracker] libtracker-extract: Fix possible XMP extractor leak

[Carlos Garnacho <carlosg src gnome org>]

commit fa4f72862e616a934ad490c2c4367ca334cbb811
Author: Carlos Garnacho <carlosg gnome org>
Date:   Sun Jan 17 18:58:26 2016 +0100

    libtracker-extract: Fix possible XMP extractor leak
    
    We may end up overwriting the TrackerXmpRegion fields here, and
    forgetting about the previous memory. Just stick to the first
    values if we iterate multiple times here.

 src/libtracker-extract/tracker-xmp.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/src/libtracker-extract/tracker-xmp.c b/src/libtracker-extract/tracker-xmp.c
index 42ade15..dda8368 100644
--- a/src/libtracker-extract/tracker-xmp.c
+++ b/src/libtracker-extract/tracker-xmp.c
@@ -573,7 +573,8 @@ iterate_simple (const gchar    *uri,
                                 */
                         } else if (!current_region->type && g_ascii_strcasecmp (propname, "mwg-rs:Type") == 
0) {
                                 current_region->type = g_strdup (value);
-                        } else if (g_str_has_prefix (strrchr (path, ']') + 2, "mwg-rs:Extensions")) {
+                        } else if (!current_region->link_class && !current_region->link_uri &&
+                                   g_str_has_prefix (strrchr (path, ']') + 2, "mwg-rs:Extensions")) {
                                 current_region->link_class = g_strdup (propname);
                                 current_region->link_uri = g_strdup (value);
                         }