mm/memcg: move generation assignment and comparison together

For each round-trip, we assign generation on first invocation and compare
it on subsequent invocations.

Let's move them together to make it more self-explaining. Also this
reduce a check on prev.

[[email protected]: better comment to explain reclaim model]
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Wei Yang <[email protected]>
Acked-by: Johannes Weiner <[email protected]>
Reviewed-by: Roman Gushchin <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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