fix osgen cannot parse.

[iiiusky]

I found that osgen always has no value in the process of using it. I saw that there is a problem with the label in the code. And fixes, request merges

Before fix:

OsGen    string `xml"osgen,attr" `

After fix:

OsGen    string `xml:"osgen,attr" json:"osgen"`

[iiiusky]

@tomsteele