[farsight2/master] Add sanity check

[Olivier Crête]

---
 gst/fsrtpconference/fs-rtp-codec-negotiation.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/gst/fsrtpconference/fs-rtp-codec-negotiation.c b/gst/fsrtpconference/fs-rtp-codec-negotiation.c
index 83976ae..153b29c 100644
--- a/gst/fsrtpconference/fs-rtp-codec-negotiation.c
+++ b/gst/fsrtpconference/fs-rtp-codec-negotiation.c
@@ -701,6 +701,8 @@ codec_association_find_custom (GList *codec_associations,
 {
   GList *item;
 
+  g_return_val_if_fail (func, NULL);
+
   for (item = codec_associations;
        item;
        item = g_list_next (item))
-- 
1.5.6.5