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

2 uses

	golang.org/x/sys/unix (current package)
		syscall_linux.go#L1280: 	vallen := _Socklen(SizeofIPMreqn)
		ztypes_linux.go#L523: 	SizeofIPMreqn           = 0xc