prov/verbs: fi_pingpong does not work over 2nd interface with -61 error

[Chien Tin Tung]

In a multi-RDMA-adapter setup, fi_pingpong returns -61 when client is using the 2nd interface.

To reproduce:

• server
  fi_pingpong -d mlx5_2 -p "verbs" -e rdm

• client
  fi_pingpong -d mlx5_2 -p "verbs" -e rdm

Expected behavior
Test pass with correct output.

Output
fi_getinfo(): util/pingpong.c:1489, ret=-61 (No data available)

[Chien Tin Tung]

Resolved with PR 9971