* If @dentry is part of a hard link group, search for hard-linked dentries in
* the same directory that have a nonempty DOS (short) filename. There should
* be exactly 0 or 1 such dentries. If there is 1, extract that dentry first,
* If @dentry is part of a hard link group, search for hard-linked dentries in
* the same directory that have a nonempty DOS (short) filename. There should
* be exactly 0 or 1 such dentries. If there is 1, extract that dentry first,