iw_cxgb4: print mapped ports correctly

c4iw_ep_common structure holds the mapped addresses, so while printing
them, use appropriate pointers.

Fixes: bab572f1 ("iw_cxgb4: Guard against null cm_id in dump_ep/qp")
Signed-off-by: Potnuri Bharat Teja <bharat@chelsio.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>