hfsuser: treat orphaned hard links as regular files

Fixes an odd case where files may have the hard link file type code but
which are otherwise regular files, with data in their own catalog record
and no associated inode entry.
Previously files like this appeared in directory listings but would not
exist when read from.

This change matches the behavior of Apple's driver.

lib/libhfsuser/hfsuser.c

@@ -283,6 +283,8 @@ int hfs_lookup(hfs_volume* vol, const char* path, hfs_catalog_keyed_record_t* re
 	if(alt_fork_lookup)
 		pathcpy[pathlen - dev->rsrc_len] = '\0';
 
+	hfs_catalog_keyed_record_t inode_rec; //for resolving hard links
+
 	// lookup normally ends when either the path is exhasuted or a file is found, however there are exactly two cases
 	// where a file is permitted as part of the path: hard links to other directories, or when accessing a file's
 	// resource fork via the special /rsrc suffix
@@ -306,12 +308,10 @@ int hfs_lookup(hfs_volume* vol, const char* path, hfs_catalog_keyed_record_t* re
 
 		if(record->type == HFS_REC_FILE) {
 			if(record->file.user_info.file_creator == HFS_MACS_CREATOR &&
-			   record->file.user_info.file_type == HFS_DIR_HARD_LINK_FILE_TYPE) {
+			   record->file.user_info.file_type == HFS_DIR_HARD_LINK_FILE_TYPE &&
+			   !hfslib_get_directory_hardlink(vol, record->file.bsd.special.inode_num, &inode_rec, NULL)) {
 				// resolve directory hard links and resume path traversal
-				if(hfslib_get_directory_hardlink(vol, record->file.bsd.special.inode_num, record, NULL)) {
-					ret = -ENOENT;
-					goto end;
-				}
+				*record = inode_rec;
 				continue;
 			}
 
@@ -330,10 +330,8 @@ int hfs_lookup(hfs_volume* vol, const char* path, hfs_catalog_keyed_record_t* re
 	if(record->type == HFS_REC_FILE &&
 	   record->file.user_info.file_creator == HFS_HFSPLUS_CREATOR &&
 	   record->file.user_info.file_type == HFS_HARD_LINK_FILE_TYPE &&
-	   hfslib_get_hardlink(vol, record->file.bsd.special.inode_num, record, NULL)) {
-		ret = -ENOENT;
-		goto end;
-	}
+	   !hfslib_get_hardlink(vol, record->file.bsd.special.inode_num, &inode_rec, NULL))
+		   *record = inode_rec;
 
 	if(!alt_fork_lookup) // don't cache alternate fork lookups
 		hfs_record_cache_add(cache,path,pathlen,record,key);