net: tun: Convert to use sysfs_emit() APIs
Follow the advice of the Documentation/filesystems/sysfs.rst and show() should only use sysfs_emit() or sysfs_emit_at() when formatting the value to be returned to user space. Signed-off-by: Wang Yufen <wangyufen@huawei.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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