The number of bytes may only be specified if a device number id provided.
Correct the formatting.
Acked-by: Marek Behún <kabel@kernel.org>
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
The 'rng list' command probes all RNG devices and list those devices
that are successfully probed. Also update the help info.
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Weizhao Ouyang <o451686892@gmail.com>