RDMA: Consolidate patterns with sizeof() to ib_copy_validate_udata_in()

RDMA: Consolidate patterns with sizeof() to ib_copy_validate_udata_in()

Similar to the prior patch, these patterns are open coding an
offsetofend() using sizeof(), which targets the last member of the
current struct.

Reviewed-by: Long Li <longli@microsoft.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Bernard Metzler <bernard.metzler@linux.dev>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>