Data race on currentid

[AlekSi]

go-syslog/rfc5424/builder.go

Lines 64 to 65 in ac565dc

	var currentid string
	var currentparamname string

Those two variables are defined on the package level. That means that two independent rfc5424.SyslogMessage objects with structured data can't be built concurrently – race detector correctly reports unsynchronised writes.

[leodido]

You're right, thanks for spotting it!

The fix is not that difficult but I don't have any spare time to do it. Would love to review a PR, tho!