iw_cxgb4: remove duplicate memcpy() in c4iw_create_listen()

memcpy() of mapped addresses is done twice in c4iw_create_listen(),
removing the duplicate memcpy().

Fixes: 170003c8 ("iw_cxgb4: remove port mapper related code")
Reviewed-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Potnuri Bharat Teja <bharat@chelsio.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>