cosmetic: fix doxygen for mgcp_cleanup_rtp_bridge_cb()

Change-Id: I231b9026402a0f0d3aa23c8de748fc7e88b8bb36
diff --git a/src/libosmo-mgcp/mgcp_network.c b/src/libosmo-mgcp/mgcp_network.c
index 1ad9c1a..3d01918 100644
--- a/src/libosmo-mgcp/mgcp_network.c
+++ b/src/libosmo-mgcp/mgcp_network.c
@@ -1330,8 +1330,7 @@
 
 /*! cleanup an endpoint when a connection on an RTP bridge endpoint is removed.
  *  \param[in] endp Endpoint on which the connection resides.
- *  \param[in] conn Connection that is about to be removed (ignored).
- *  \returns 0 on success, -1 on ERROR. */
+ *  \param[in] conn Connection that is about to be removed (ignored). */
 void mgcp_cleanup_rtp_bridge_cb(struct mgcp_endpoint *endp, struct mgcp_conn *conn)
 {
 	struct mgcp_conn *conn_cleanup;