rdma: add missing break

When retval is not 0, we don't want to fail through default.

Signed-off-by: Jack Wang <jinpu.wang@profitbricks.com>
Signed-off-by: Shlomo Pongratz <shlomop@mellanox.com>
remove dead code in xio_tasks_pool_init

Signed-off-by: Jack Wang <jinpu.wang@profitbricks.com>
Signed-off-by: Shlomo Pongratz <shlomop@mellanox.com>