rbd: get rid of snap_name_len
The value returned in the "snap_name_len" argument to rbd_add_parse_args() is never actually used, so get rid of it. The snap_name_len recorded in rbd_dev_v2_snap_name() is not useful either, so get rid of that too. Signed-off-by: NAlex Elder <elder@inktank.com> Reviewed-by: NJosh Durgin <josh.durgin@inktank.com>
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