patutil/PackagePath: fix check savePkg first and godoc comment
patutil/PackagePath: fix check savePkg first and godoc comment

- same as fix PackageID

Signed-off-by: Koichi Shiraishi <2e5bdfebde234ed3509bcfc18121c70b6631e207@gmail.com>

zchee/nvim-go,zchee/nvim-go