IB/hfi1: Assign npages earlier

IB/hfi1: Assign npages earlier

[ Upstream commit c3902dea763c2945070b91be65fb3fb2486d9c59 ]

Improve code clarity and enable earlier use of
tidbuf->npages by moving its assignment to
structure creation time.

Signed-off-by: Dean Luick <dean.luick@cornelisnetworks.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@cornelisnetworks.com>
Link: https://lore.kernel.org/r/167329104884.1472990.4639750192433251493.stgit@awfm-02.cornelisnetworks.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>