Fix formatting.
Fix formatting.

* src/agent.c (scute_agent_get_random): Use '%zu'.

--
'%lu' is wrong on some arch where size_t is unsigned int.
Since we use gpgrt_snprintf, we can depend on the '%z' feature.

Signed-off-by: NIIBE Yutaka <34feb69f206f6fec69fb4bd79c126fcbde2c8e6a@fsij.org>

gpg/scute,gpg/scute,gpg/scute