lib/scatterlist: Avoid potential scatterlist entry overflow

Since the scatterlist length field is an unsigned int, make
sure that sg_alloc_table_from_pages does not overflow it while
coalescing pages to a single entry.

v2: Drop reference to future use. Use UINT_MAX.
v3: max_segment must be page aligned.
v4: Do not rely on compiler to optimise out the rounddown.
    (Joonas Lahtinen)
v5: Simplified loops and use post-increments rather than
    pre-increments. Use PAGE_MASK and fix comment typo.
    (Andy Shevchenko)
v6: Commit spelling fix.

Signed-off-by: Tvrtko Ursulin <[email protected]>
Cc: Masahiro Yamada <[email protected]>
Cc: [email protected]
Reviewed-by: Chris Wilson <[email protected]>
Cc: Joonas Lahtinen <[email protected]>
Cc: Andy Shevchenko <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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