xen/blkback: don't free be structure too early
The be structure must not be freed when freeing the blkif structure isn't done. Otherwise a use-after-free of be when unmapping the ring used for communicating with the frontend will occur in case of a late call of xenblk_disconnect() (e.g. due to an I/O still active when trying to disconnect). Signed-off-by: NJuergen Gross <jgross@suse.com> Tested-by: NSteven Haigh <netwiz@crc.id.au> Acked-by: NRoger Pau Monné <roger.pau@citrix.com> Signed-off-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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