Merge tag 'block-pull-request' of https://gitlab.com/stefanha/qemu into staging

Merge tag 'block-pull-request' of https://gitlab.com/stefanha/qemu into staging

Pull request

QED need_check_timer use-after-free fix

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* tag 'block-pull-request' of https://gitlab.com/stefanha/qemu:
  block/qed: fix use-after-free by nullifying timer pointer after free

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