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block: Catch !bs->drv in bdrv_check()
qemu-img check calls bdrv_check() twice if the first run repaired some inconsistencies. If the first run however again triggered corruption prevention (on qcow2) due to very bad inconsistencies, bs->drv may be NULL afterwards. Thus, bdrv_check() should check whether bs->drv is set. Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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