opendir() did not correctly set "errno" if sys_open_dir() failed.

git-svn-id: file:///srv/svn/repos/haiku/trunk/current@4297 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/kernel/libroot/posix/unistd/directory.c

@@ -30,8 +30,10 @@ opendir(const char *path)
 	DIR *dir;
 
 	int fd = sys_open_dir(path);
-	if (fd < 0)
+	if (fd < 0) {
+		errno = fd;
 		return NULL;
+	}
 
 	/* allocate the memory for the DIR structure */
 	if ((dir = (DIR *)malloc(sizeof(DIR) + BUFFER_SIZE)) == NULL) {