Bluetooth: Controller: Fix adv aux release on insufficient resources

Fix missing adv aux release on insufficient adv data buffers
configured when starting multiple extended advertising sets.

Signed-off-by: Vinayak Kariappa Chettimada <[email protected]>

Author: cvinayak

subsys/bluetooth/controller/ll_sw/ull_adv_aux.c

@@ -2694,6 +2694,9 @@ struct ll_adv_aux_set *ull_adv_aux_acquire(struct lll_adv *lll)
 	lll_adv_data_reset(&lll_aux->data);
 	err = lll_adv_aux_data_init(&lll_aux->data);
 	if (err) {
+		lll->aux = NULL;
+		aux_release(aux);
+
 		return NULL;
 	}