[gthumb] unref the object only if it's not NULL

[Paolo Bacchilega <paobac src gnome org>]

commit 8163203a4481321264736b070f8a8b1c7ca39e3b
Author: Paolo Bacchilega <paobac src gnome org>
Date:   Thu Dec 9 11:50:41 2010 +0100

    unref the object only if it's not NULL

 gthumb/gth-icon-cache.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)
---
diff --git a/gthumb/gth-icon-cache.c b/gthumb/gth-icon-cache.c
index 1d117cd..cf61180 100644
--- a/gthumb/gth-icon-cache.c
+++ b/gthumb/gth-icon-cache.c
@@ -106,9 +106,8 @@ _gth_icon_cache_get_icon_key (GIcon *icon)
 			key = get_static_string (filename);
 
 			g_free (filename);
+			g_object_unref (file);
 		}
-
-		g_object_unref (file);
 	}
 
 	return key;