RDMA/odp: Check for overflow when computing the umem_odp end

Since the page size can be extended in the ODP case by IB_ACCESS_HUGETLB
the existing overflow checks done by ib_umem_get() are not
sufficient. Check for overflow again.

Further, remove the unchecked math from the inlines and just use the
precomputed value stored in the interval_tree_node.

Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Leon Romanovsky <[email protected]>
Signed-off-by: Jason Gunthorpe <[email protected]>

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