host/audio/ble_iso.c: fix deallocation of BIS

Freeing memory back to BIS pool in loop while changing removing ISO
connections from list lead to memory leak. Now, memory is freed in
separate loop.

nimble/host/src/ble_iso.c

@@ -205,6 +205,10 @@ static int
 ble_iso_big_free(struct ble_iso_big *big)
 {
  struct ble_iso_conn *conn;
+ struct ble_iso_bis *rem_bis[MYNEWT_VAL(BLE_ISO_MAX_BISES)] = {
+ [0 ... MYNEWT_VAL(BLE_ISO_MAX_BISES) - 1] = NULL
+ };
+ uint8_t i = 0;
 
  SLIST_FOREACH(conn, &ble_iso_conns, next) {
  struct ble_iso_bis *bis;
@@ -216,10 +220,14 @@ ble_iso_big_free(struct ble_iso_big *big)
  bis = CONTAINER_OF(conn, struct ble_iso_bis, conn);
  if (bis->big == big) {
  SLIST_REMOVE(&ble_iso_conns, conn, ble_iso_conn, next);
- os_memblock_put(&ble_iso_bis_pool, bis);
+ rem_bis[i++] = bis;
  }
  }
 
+ while (i > 0) {
+ os_memblock_put(&ble_iso_bis_pool, rem_bis[--i]);
+ }
+
  SLIST_REMOVE(&ble_iso_bigs, big, ble_iso_big, next);
  os_memblock_put(&ble_iso_big_pool, big);
  return 0;