Chunk server: fix assertion failure in chunk allocation completion by adding missing reset of disk io smart pointer in the case when the request enqueue fails (due to out of requests).
Chunk server: fix assertion failure in chunk allocation completion by adding missing reset of disk io smart pointer in the case when the request enqueue fails (due to out of requests).

quantcast/qfs,qnu/qfs,thebigbrain/qfs,chanwit/qfs,fengshao0907/qfs,qnu/qfs,quantcast/qfs,chanwit/qfs,qnu/qfs,thebigbrain/qfs,quantcast/qfs,quantcast/qfs,quantcast/qfs,quantcast/qfs,qnu/qfs,qnu/qfs,thebigbrain/qfs,thebigbrain/qfs,quantcast/qfs,chanwit/qfs,chanwit/qfs,thebigbrain/qfs,fengshao0907/qfs,thebigbrain/qfs,fengshao0907/qfs,fengshao0907/qfs,qnu/qfs,thebigbrain/qfs,fengshao0907/qfs,thebigbrain/qfs,qnu/qfs,chanwit/qfs,fengshao0907/qfs,chanwit/qfs,chanwit/qfs,fengshao0907/qfs,chanwit/qfs,quantcast/qfs,fengshao0907/qfs,qnu/qfs