rdma/cm: set num_paths when manually assigning path records

rdma/cm: set num_paths when manually assigning path records

We manually assigning the path records to use for a connection,
save the number of paths that were saved.  Otherwise, checks
against num_path will show 0, even though path record data is
available.

This was discovered by manually setting the path records from
user space, then querying the kernel to see if the correct
path records were assigned.

Signed-off-by: Sean Hefty <sean.hefty@intel.com>