[Bug 241178] makefs segfault when manifest include symlinks without the link keyword

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=241178

            Bug ID: 241178
           Summary: makefs segfault when manifest include symlinks without
                    the link keyword
           Product: Base System
           Version: 12.0-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: sheda at fsfe.org

Created attachment 208226
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=208226&action=edit
link type require the link keyword

With a directory d/ containing the following 2 files:

    -rw-r--r--  1 root  wheel  14 Oct 10 11:55 hello.txt
    lrwxr-xr-x  1 root  wheel   9 Oct 10 11:55 world.txt -> hello.txt

using mtree to build a manifest as follow:

    mtree -ck mode -p ./d | mtree -C > no-link-kw.makefs-manifest

here is the resulting manifest:    

    . type=dir mode=0755
    ./hello.txt type=file mode=0644
    ./world.txt type=link mode=0755

running makefs as follow lead to segfault:

    cd d
    makefs -t ffs -o optimization=space -o version=2 ../no-link-kw.img
../no-link-kw.makefs-manifest

Attached is a small fix that ensure makefs will complain about the missing link
keyword when facing a link type node.

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