Bluetooth: BAP: Add missing ep check in client_qos

The bt_bap_unicast_client_qos function was recently
modified to check for presentation delay, however it did
not consider that a unicast group may contain streams that
are not configured, and thus do not have endpoints.

Add a stream->ep != NULL check to only consider configured
streams.

Signed-off-by: Emil Gydesen <[email protected]>

Author: Thalley

subsys/bluetooth/audio/bap_unicast_client.c

@@ -3328,6 +3328,11 @@ int bt_bap_unicast_client_qos(struct bt_conn *conn, struct bt_bap_unicast_group
 			continue;
 		}
 
+		if (stream->ep == NULL) {
+			/* Only consider configured streams */
+			continue;
+		}
+
 		ep = stream->ep;
 		dir = ep->dir;