fix: update cwd_read to assign vfsmnt correctly

[arthur-zhang]

Fixes

Description

cwd_read do not assign data->vfsmnt correctly. in container env, the cwd_read will obtain all the file path to root like when read /tmp/tetragon. it will make arg match failed

/scon/containers/01J6HEV7R29R4WXXS1N2CS9ATP/rootfs/tmp/tetragon

in the old code, mnt is pointer to the old data->mnt, which is not correct.

struct mount *mnt = data->mnt;
...
if (data->mnt != parent) {
    probe_read(&data->dentry, sizeof(data->dentry),
			    _(&mnt->mnt_mountpoint));
    data->mnt = parent;
    probe_read(&data->vfsmnt, sizeof(data->vfsmnt),
			    _(&mnt->mnt));
    return 0;
}

Changelog

todo!