block/null: Implement bdrv_refresh_filename()
The null block driver ignores any filename used for creating its BDSs, which allows creating such BDSs even without any filename at all. In that case, we currently construct a JSON filename when queried instead of a plain "null-co://" or "null-aio://". This patch implements bdrv_refresh_filename() to remedy this behavior. Signed-off-by: NMax Reitz <mreitz@redhat.com> Message-id: 20160610185750.30956-4-mreitz@redhat.com [mreitz@redhat.com: Added commit message] Signed-off-by: NMax Reitz <mreitz@redhat.com>
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