[glib] Don't dereference identifier_type if it is NULL (#579558)

[Alexander Larsson <alexl src gnome org>]

commit ab29e09dac547c501892cac8cd64721c3f157f00
Author: Alexander Larsson <alexl redhat com>
Date:   Wed May 20 14:46:51 2009 +0200

    Don't dereference identifier_type if it is NULL (#579558)
---
 gio/gunixvolume.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/gio/gunixvolume.c b/gio/gunixvolume.c
index 16e7067..91cb346 100644
--- a/gio/gunixvolume.c
+++ b/gio/gunixvolume.c
@@ -487,7 +487,8 @@ g_unix_volume_get_identifier (GVolume              *volume,
 {
   GUnixVolume *unix_volume = G_UNIX_VOLUME (volume);
 
-  if (strcmp (kind, unix_volume->identifier_type) == 0)
+  if (unix_volume->identifier_type != NULL &&
+      strcmp (kind, unix_volume->identifier_type) == 0)
     return g_strdup (unix_volume->identifier);
   return NULL;
 }