HID: wacom: wacom_setup_numbered_buttons is local to wacom_wac
HID: wacom: wacom_setup_numbered_buttons is local to wacom_wac

wacom_setup_numbered_buttons() is not used outside of wacom_wac.c,
make it static.

Signed-off-by: Jiri Kosina <ed58f755cc8caaf10c3e8c731a8b86fb8f13d6cb@suse.cz>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs