For sysfs outputs, it's safer to use a new helper, sysfs_emit(),
instead of the raw sprintf() & co.  This patch replaces those usages
straightforwardly with new helpers, sysfs_emit() and sysfs_emit_at().

Link: https://lore.kernel.org/r/20220801165639.26030-7-tiwai@suse.deSigned-off-by: Takashi Iwai <tiwai@suse.de>