x86/mm: Replace nodes_weight() with nodes_empty() where appropriate

Various mm code calls nodes_weight() to check if any bit of a given
nodemask is set.

This can be done more efficiently with nodes_empty() because nodes_empty()
stops traversing the nodemask as soon as it finds first set bit, while
nodes_weight() counts all bits unconditionally.

Signed-off-by: Yury Norov <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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