qed: introduce bdrv_qed_init_state
This will be used in the next patch, which will call bdrv_qed_do_open with a CoMutex taken. bdrv_qed_init_state provides a nice place to initialize it. Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com> Message-Id: <20170629132749.997-9-pbonzini@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com> Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com> Reviewed-by: NFam Zheng <famz@redhat.com> Signed-off-by: NFam Zheng <famz@redhat.com>
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