lldp: replace if with assert_cc
LLDP_TX_HOLD or one of the other variables might be changed in the future resulting in a silent error here if the if was just removed. Replacement for #2983.
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@ -239,9 +239,8 @@ static int link_send_lldp(Link *link) {
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(void) gethostname_strict(&hostname);
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(void) parse_env_file("/etc/machine-info", NEWLINE, "PRETTY_HOSTNAME", &pretty_hostname, NULL);
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assert_cc(LLDP_TX_INTERVAL_USEC * LLDP_TX_HOLD + 1 <= (UINT16_MAX - 1) * USEC_PER_SEC);
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ttl = DIV_ROUND_UP(LLDP_TX_INTERVAL_USEC * LLDP_TX_HOLD + 1, USEC_PER_SEC);
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if (ttl > (usec_t) UINT16_MAX)
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ttl = (usec_t) UINT16_MAX;
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caps = (link->network && link->network->ip_forward != ADDRESS_FAMILY_NO) ?
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SD_LLDP_SYSTEM_CAPABILITIES_ROUTER :
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