No check after GetDowngradeInfo()

[partimScurra]

Static analysis tool flagged an instance of GetDowngradeInfo() that lacks a nil check of downgradeInfo and goes straight to .Enabled check, unlike other instances of this function being called.

etcd/server/etcdserver/version/version.go

Lines 76 to 77 in 3531079

	downgradeInfo := m.s.GetDowngradeInfo()
	if !downgradeInfo.Enabled {