x86: Replace cpumask_weight() with cpumask_empty() where appropriate

In some cases, x86 code calls cpumask_weight() to check if any bit of a
given cpumask is set.

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

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

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