policy: only trigger roam-sm after client becomes roamable

Onky trigger the roaming-sm after a client becomes roamable. This is the
case when a STA is connected for longer than roam_trigger_interval.

Signed-off-by: David Bauer <mail@david-bauer.net>

policy.c

@@ -401,6 +401,10 @@ usteer_local_node_roam_sm_active(struct sta_info *si, int min_signal)
 	if (current_time - si->roam_kick < config.roam_trigger_interval)
 		return false;
 
+	/* Skip if connection is established shorter than the trigger-interval */
+	if (current_time - si->connected_since < config.roam_trigger_interval)
+		return false;
+	
 	return true;
 }