Merge tag 'net-pull-request' of https://github.com/jasowang/qemu into staging

Merge tag 'net-pull-request' of https://github.com/jasowang/qemu into staging

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* tag 'net-pull-request' of https://github.com/jasowang/qemu:
  net: do not delete nics in net_cleanup()
  net: Update MemReentrancyGuard for NIC
  net: Provide MemReentrancyGuard * to qemu_new_nic()

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>