core: detect_container() may return negative errno
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@ -893,7 +893,7 @@ void emit_bpf_firewall_warning(Unit *u) {
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static bool warned = false;
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if (!warned) {
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bool quiet = bpf_firewall_unsupported_reason == -EPERM && detect_container();
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bool quiet = bpf_firewall_unsupported_reason == -EPERM && detect_container() > 0;
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log_unit_full_errno(u, quiet ? LOG_DEBUG : LOG_WARNING, bpf_firewall_unsupported_reason,
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"unit configures an IP firewall, but %s.\n"
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