platform/x86: panasonic-laptop: Replace snprintf in show functions with sysfs_emit

platform/x86: panasonic-laptop: Replace snprintf in show functions with sysfs_emit

[ Upstream commit 2d5b0755b754fcb39598df87b3a8656a569e9979 ]

show() must not use snprintf() when formatting the value to be
returned to user space.

Fix the coccicheck warnings:
WARNING: use scnprintf or sprintf.

Use sysfs_emit instead of scnprintf or sprintf makes more sense.

Signed-off-by: Qing Wang <wangqing@vivo.com>
Link: https://lore.kernel.org/r/1634280641-4862-1-git-send-email-wangqing@vivo.com
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Stable-dep-of: 5c7bebc1a3f0 ("platform/x86: panasonic-laptop: Return errno correctly in show callback")
Signed-off-by: Sasha Levin <sashal@kernel.org>