kernel/ksysfs.c: use sysfs_emit for sysfs show handlers

sysfs_emit() is the recommended way to format strings for sysfs as per
Documentation/filesystems/sysfs.rst.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Link: https://lore.kernel.org/r/20230324-ksysfs-sysfs_emit-v1-1-67c03cddc8a6@weissschuh.net


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>