mrp_subproduct bad calculation

Hello,

I test mrp_subproduct module and I see in code an error on subproduct product_qty and product_uos_qty calculation: i.e:

Source:

qty1 = sub_product.product_qty
qty2 = production.product_uos and production.product_uos_qty or False
if sub_product.subproduct_type=='variable':
    if production.product_qty:
        qty1 *= production.product_qty / (sub_product.product_qty or 1.0)
    if production.product_uos_qty:
        qty2 *= production.product_uos_qty / (sub_product.product_qty or 1.0)

If subproduct_type is variable and subproduct_qty is 2 and production_qty = 50, result on subproduct_qty is 50 (2 *= 50 / 2) but real result will be 100. In product_uos_qty tghe result is more poor yet. I attached one patch.

If subproduct type is fixed and subproduct.product_qty = 3 and then I produce 50 on production.product_qty the result is 3 not calculate, it can be well.