[easytag] Return a value where it is required to do so

[David King <davidk src gnome org>]

commit a9eb8c8c03114c4a2b18a3a2b80765c39c20c0c0
Author: David King <amigadave amigadave com>
Date:   Fri Jan 11 16:40:52 2013 +0000

    Return a value where it is required to do so

 src/charset.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/src/charset.c b/src/charset.c
index 284e213..3677ede 100644
--- a/src/charset.c
+++ b/src/charset.c
@@ -823,4 +823,6 @@ gboolean test_conversion_charset (const gchar *from, const gchar *to)
         g_free(temp);
         return TRUE;
     }
+
+    return NULL;
 }