resolve addr failed on b2b intefaces on single host

[Changcheng Liu <changchengx.liu@xxxxxxxxxxx>]

Hi all,
    In one host, there're two RNICs connected back to back.
    src rnic0's ip is 192.168.30.2/24 and dst rnic1's ip is
    192.168.30.4/24.

    Does anyone know why rdma_resolve_addr failed when setting the
    source sockaddr(191.168.30.2) and target sockaddr(192.168.30.4)?

    Example code is here: https://pastecode.io/s/6nc4qx46

B.R.
Changcheng