[glib] gcontenttype: Duplicate the string inside Mutex lock for thread-safety

[Akira Tagoh <tagoh src gnome org>]

commit 7261294ec163234e52f0edeb24df0b18f5e77395
Author: Akira TAGOH <akira tagoh org>
Date:   Thu Jan 24 12:33:39 2013 +0900

    gcontenttype: Duplicate the string inside Mutex lock for thread-safety
    
    https://bugzilla.gnome.org/show_bug.cgi?id=692360

 gio/gcontenttype.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/gio/gcontenttype.c b/gio/gcontenttype.c
index 6cc805c..5d49b7e 100644
--- a/gio/gcontenttype.c
+++ b/gio/gcontenttype.c
@@ -666,8 +666,9 @@ g_content_type_guess (const gchar  *filename,
   /* Got an extension match, and no conflicts. This is it. */
   if (n_name_mimetypes == 1)
     {
+      gchar *s = g_strdup (name_mimetypes[0]);
       G_UNLOCK (gio_xdgmime);
-      return g_strdup (name_mimetypes[0]);
+      return s;
     }
 
   if (data)