libceph: use cursor resid for loop condition
Use the "resid" field of a cursor rather than finding when the message data position has moved up to meet the data length to determine when all data has been sent or received in write_partial_message_data() and read_partial_msg_data(). This is cleanup of old code related to: http://tracker.ceph.com/issues/4428Signed-off-by: Alex Elder <elder@inktank.com> Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
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