Cannot set ZMQ_HEARTBEAT_TTL to more than 655.3 seconds

[sigiesec]

Issue description

The maximum value for ZMQ_HEARTBEAT_TTL is not correctly checked.

Environment

• libzmq version (commit hash if unreleased): 50374bf
• OS: any

Minimal test code / Steps to reproduce the issue

int value = 655400;
zmq_setsockopt (socket, ZMQ_HEARTBEAT_TTL, &value, sizeof (value))

What's the actual result? (include assertion message & call stack if applicable)

-1 / EINVAL

What's the expected result?

0