xen-netback: keep a local pointer for vif in backend_disconnect()
This patch replaces use of 'be->vif' with 'vif' and hence generally makes the function look tidier. No semantic change. Signed-off-by: NPaul Durrant <paul.durrant@citrix.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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