Commit r59674 is breaking HPPA builds

[Frans Pop <elendil@planet.nl>]

Hi Colin,

Daily builds for HPPA have been failing for some time with:
E: Couldn't find package input-modules-2.6.30-1-parisc-di
make[2]: *** [stamps/get_udebs-netboot-stamp] Error 100
make[1]: *** [_build] Error 2
make: *** [build_netboot] Error 2

After reverting r59674 they work again, so something must be wrong with 
that change. Can you look into it please?

Thanks,
FJP