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Compute the directory length

    There can be padding at the end of the buffer for alignment.
    All we can rely on is the '\0' terminator.

--- a/libstd/dir-linux.myr

+++ b/libstd/dir-linux.myr

@@ -50,8 +50,11 @@

 	;;

 	dent = &d.buf[d.off] castto(dirent64#)

-	namelen = (dent.reclen - Direntoverhead) castto(size)

+	namelen = 0

 	d.off += dent.reclen castto(int64)

+	while dent.name[namelen] != 0

+		namelen++

+	;;

 	-> `Some sldup(dent.name[:namelen])

 }