fix: prevent fd leak in TraversalType2 implementation

[Johnson-zs]

No description provided.

[Johnson-zs]

sqfs_destroy only releases memory resources and does not close file descriptors.

[TheAssassin]

Could you please explain this in more detail? It seems like a bug in squashfuse to me. You have to include another header for this to work, actually. The destroy function should take care of this it seems.

[Johnson-zs]

Could you please explain this in more detail? It seems like a bug in squashfuse to me. You have to include another header for this to work, actually. The destroy function should take care of this it seems.

Actually, I also discovered this issue after noticing the FD leak and reading the squashfuse source code. The sqfs_open_image is a convenience function that encapsulates open + init, while sqfs_destroy only handles the cleanup corresponding to init but lacks the cleanup for open.

Additionally, I noticed in its source code (https://github.com/vasi/squashfuse/blob/e1e237a7ee9f0646d05aa85d20939c49555279db/ls.c#L73) that after calling sqfs_open_image, sqfs_fd_close is also used to clean up the FD.