[MiNT] opendir() regression

[Vincent Rivière <vincent.riviere@freesbee.fr>]

Hello.

In order to check GCC is OK, I have just recompiled coreutils-6.9. The pwd 
command does not work as expected in a specific case, probably due to a 
regression in the MiNTLib.

Basically:
root@easymint:/f>pwd
./pwd: cannot open directory `..': Internal error

The kernel:
The problem happens only with old kernels and Ozk snapshot,
but it works fine with the trunk and Helmut snapshot.

The MiNTLib:
My old pwd compiled from the same sources with an old CVS MiNTLib works fine 
on every kernel. This supposes that the bug is in the MiNTLib.

The current directory and file system:
This problems appears only on ARAnyM's hostfs mounts, when the current 
directory is a hostfs root, like /f.

The problem occurs because pwd does always opendir("..").
As a summary, this fails on old and Ozk kernels when the current directory 
is an hostfs root.

This has probably some relation with Alan's evolutions on directories.

See the attached testcase.

--
Vincent Rivière

#include <stdio.h>
#include <dirent.h>
#include <errno.h>

int main(void)
{
	DIR* dirp = opendir("..");
	
	if (!dirp)
	{
		fprintf(stderr, "error: %s\n", strerror(errno));
		return 1;
	}

	puts("OK");

	return 0;
}