RDMA/cxgb4: Set sq_sig_type correctly

Replace '0' with IB_SIGNAL_REQ_WR given the sq_sig_type is either
IB_SIGNAL_ALL_WR or IB_SIGNAL_REQ_WR per the below.

enum ib_sig_type {
	IB_SIGNAL_ALL_WR,
	IB_SIGNAL_REQ_WR
};

Signed-off-by: Guoqing Jiang <guoqing.jiang@linux.dev>
Link: https://lore.kernel.org/r/20230731092106.10396-1-guoqing.jiang@linux.dev


Signed-off-by: Leon Romanovsky <leon@kernel.org>