weston-log-flight-rec: Don't allow more than one flight recorder to be

created

Having a (single) global variable which others depend on it implies
having a single flight recorder present. Until we have a reason to
support multiple flight recorders limit the amount to a maximum of one.

Signed-off-by: Marius Vlad <marius.vlad@collabora.com>
Reported-by: Pekka Paalanen <pekka.paalanen@collabora.com>

libweston/weston-log-flight-rec.c

@@ -233,6 +233,9 @@ weston_log_subscriber_create_flight_rec(size_t size)
 	struct weston_debug_log_flight_recorder *flight_rec;
 	char *weston_rb;
 
+	assert("Can't create more than one flight recorder." &&
+			!weston_primary_flight_recorder_ring_buffer);
+
 	flight_rec = zalloc(sizeof(*flight_rec));
 	if (!flight_rec)
 		return NULL;