rbd: kill rbd_req_coll and rbd_request
The two remaining callers of rbd_do_request() always pass a null collection pointer, so the "coll" and "coll_index" parameters are not needed. There is no other use of that data structure, so it can be eliminated. Deleting them means there is no need to allocate a rbd_request structure for the callback function. And since that's the only use of *that* structure, it too can be eliminated. Signed-off-by: NAlex Elder <elder@inktank.com> Reviewed-by: NJosh Durgin <josh.durgin@inktank.com>
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