RDMA: Remove a few extra calls to ib_get_client_data()

These four places already have easy access to the client data, just use
that instead.

Link: https://lore.kernel.org/r/0-v1-fae83f600b4a+68-less_get_client_data%25jgg@mellanox.com


Acked-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>