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Use the generic sysfs_emit_at() and sysfs_emit() function to take place
of scnprintf()
Signed-off-by: Qi Liu <liuqi115@huawei.com>
Link: https://lore.kernel.org/r/1616148273-16374-3-git-send-email-liuqi115@huawei.com

Signed-off-by: Will Deacon <will@kernel.org>