stackleak: Use a copy of the ctl_table argument

Sysctl handlers are not supposed to modify the ctl_table passed to them.
Adapt the logic to work with a temporary variable, similar to how it is
done in other parts of the kernel.

This is also a prerequisite to enforce the immutability of the argument
through the callbacks.

Reviewed-by: Luis Chamberlain <[email protected]>
Signed-off-by: Thomas Weißschuh <[email protected]>
Reviewed-by: Tycho Andersen <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Kees Cook <[email protected]>

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