octeontx2: don't mess with ->d_parent or ->d_parent->d_name

use debugfs_{create_file,get}_aux_num() instead.

[and for fsck sake, don't call variables filp - especially the
ones that are not even struct file *]

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Link: https://lore.kernel.org/r/20250112080705.141166-19-viro@zeniv.linux.org.uk


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>