fixed bug where the root directory path name was being added to the filename twice. It was initially added in the listFiles/listDirectories functions and then added again in the private function list. I modified the code so it is only added in the list function now.

#ifndef _AL_ERROR_H_
#define _AL_ERROR_H_

#include "AL/al.h"

#ifdef __cplusplus
extern "C" {
#endif

ALvoid alSetError(ALenum errorCode);

#ifdef __cplusplus
}
#endif

#endif