References: golang.org/x/sys/unix.NFTA_TARGET

const golang.org/x/sys/unix.NFTA_TARGET_UNSPEC

one use

	golang.org/x/sys/unix (current package)
		ztypes_linux.go#L2315: 	NFTA_TARGET_UNSPEC = 0x0

The pages are generated with Golds v0.4.9. (GOOS=linux GOARCH=amd64)