Close Ipv4 server when failing to start Ipv6 (dart-lang/http_multi_server#12)

Fixes a bug that could prevent the VM from shutting down if there is a
port conflict with Ipv6 but not Ipv4.
3 files changed
tree: 74a1fd29bd6c670a1c3646ea73031542403e6b64
  1. pkgs/