RDMA/rtrs-clt: Fix the initial value of min_latency

The type of min_latency is ktime_t, so use KTIME_MAX to initialize the
initial value.

Fixes: dc3b66a0 ("RDMA/rtrs-clt: Add a minimum latency multipath policy")
Link: https://lore.kernel.org/r/20211124081040.19533-1-jinpu.wang@ionos.com


Signed-off-by: Jack Wang <jinpu.wang@ionos.com>
Reviewed-by: Guoqing Jiang <Guoqing.Jiang@linux.dev>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>