block: Drop useless bdrv_new() call
bdrv_append_temp_snapshot() uses bdrv_new() to create an empty BDS before invoking bdrv_open() on that BDS. This is probably a relict from when it used to do some modifications on that empty BDS, but now that is unnecessary, so we can just set bs_snapshot to NULL and let bdrv_open() do the rest. Signed-off-by:Max Reitz <mreitz@redhat.com> Reviewed-by:
Alberto Garcia <berto@igalia.com> Reviewed-by:
Kevin Wolf <kwolf@redhat.com> Signed-off-by:
Kevin Wolf <kwolf@redhat.com>
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