module: Make module sysfs functions private.
These were placed in the header in ef665c1a to get the various SYSFS/MODULE config combintations to compile. That may have been necessary then, but it's not now. These functions are all local to module.c. Signed-off-by: Rusty Russell <email@example.com> Cc: Randy Dunlap <firstname.lastname@example.org>
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