Fix the issue of printing data overflow.

[wangfakang]

Fix the issue of printing data overflow. friendly ping @AddyLaddy @sjeaugey .

uint32_t byte_len;
uint64_t wr_id;

nccl/src/include/ibvcore.h

Lines 302 to 316 in 178b6b7

	struct ibv_wc {
	uint64_t wr_id;
	enum ibv_wc_status status;
	enum ibv_wc_opcode opcode;
	uint32_t vendor_err;
	uint32_t byte_len;
	uint32_t imm_data; /* in network byte order */
	uint32_t qp_num;
	uint32_t src_qp;
	int wc_flags;
	uint16_t pkey_index;
	uint16_t slid;
	uint8_t sl;
	uint8_t dlid_path_bits;
	};

For example, in the following example, the len variable becomes a negative number when the size of the variable is out of bounds.

xxxx:8036:8538 [0] transport/net_ib.cc:1295 NCCL WARN NET/IB : Got completion from peer x.x.x.x <16275> with error 12, opcode 32749, len -2147483648, vendor err 129 (Send) localGid xxxxx remoteGid xxxxx

[wangfakang]

friendly ping @AddyLaddy @sjeaugey