virtio_blk: Delete an unnecessary initialisation in init_vq()
The local variable "err" will be set to an appropriate value by a following statement. Thus omit the explicit initialisation at the beginning. Signed-off-by: NMarkus Elfring <elfring@users.sourceforge.net> Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>
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