chan_rtp.c: MulticastRTP missing refcount without codec option

Fixes: #529

diff --git a/channels/chan_rtp.c b/channels/chan_rtp.c
index d6342c47c21434c97521dbd5103ed6e3e9d9f9e0..97fc2408c3ea37a6ccfd0f1cef9c41a3e651993a 100644 (file)
--- a/channels/chan_rtp.c
+++ b/channels/chan_rtp.c
@@ -129,7 +129,8 @@ static struct ast_format *derive_format_from_cap(struct ast_format_cap *cap)
                 * assignments. Signed linear @ 8kHz does not map, so if that is our
                 * only capability, we force μ-law instead.
                 */
-               fmt = ast_format_ulaw;
+               ao2_ref(fmt, -1);
+               fmt = ao2_bump(ast_format_ulaw);
        }
 
        return fmt;