SysOsalNvRead() has wrong response type

[joonas.fi]

znp-go/command.go

Line 208 in 69131cf

 func (znp *Znp) SysOsalNvRead(id uint16, offset uint8) (rsp *StatusResponse, err error) { 

I believe the correct response type is SysOsalNvReadResponse:

znp-go/model.go

Line 347 in 69131cf

 type SysOsalNvReadResponse struct { 

The incorrect one takes into account only the status, the correct one also includes the read NVRAM content

I tested and NVRAM reading works with this change.