[glib] volume monitor: don't unref NULL

[Ryan Lortie <ryanl src gnome org>]

commit 1612a4d5065e3505cf45585ffb7e890a06ff27d6
Author: Ryan Lortie <desrt desrt ca>
Date:   Tue Oct 5 02:29:47 2010 -0400

    volume monitor: don't unref NULL
    
    Fix a couple more cases of blindly calling g_object_unref() on the
    result of a function that is documented as sometimes returning NULL.

 gio/tests/volumemonitor.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)
---
diff --git a/gio/tests/volumemonitor.c b/gio/tests/volumemonitor.c
index 54123ec..e3fdc3b 100644
--- a/gio/tests/volumemonitor.c
+++ b/gio/tests/volumemonitor.c
@@ -49,7 +49,8 @@ do_volume_tests (GDrive *drive, GVolume *volume)
 
   d = g_volume_get_drive (volume);
   g_assert (d == drive);
-  g_object_unref (d);
+  if (d != NULL)
+    g_object_unref (d);
 
   mount = g_volume_get_mount (volume);
   if (mount != NULL)
@@ -126,7 +127,8 @@ test_volumes (void)
 
       drive = g_volume_get_drive (volume);
       do_volume_tests (drive, volume);
-      g_object_unref (drive);
+      if (drive != NULL)
+        g_object_unref (drive);
     }
 
   g_list_foreach (volumes, (GFunc)g_object_unref,  NULL);