FS-10667: [core] Segfault in crypto / srtp #resolve

src/switch_rtp.c

@@ -914,11 +914,11 @@ static void handle_ice(switch_rtp_t *rtp_session, switch_rtp_ice_t *ice, void *d
 		return;
 	}
 
-	switch_mutex_lock(rtp_session->ice_mutex);
-
 	READ_INC(rtp_session);
 	WRITE_INC(rtp_session);
 
+	switch_mutex_lock(rtp_session->ice_mutex);
+
 	if (!switch_rtp_ready(rtp_session)) {
 		goto end;
 	}