Fix array length bug of PureNcclCommunicator #127
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The original code has a minor bug regarding to array lengths of GPU buffers in
PureNcclCommunicator.n_elems_totalis less than or equal ton_elems_per_noderethas lengthn_elems_totalgpu_buffer_btries to copynbytes_buffer(= 4 *n_bytes_per_node) fromret, which may be longer than the length ofretand causes error.