CVE-2026-53000: netfilter: nat: use kfree_rcu to release ops

In the Linux kernel, the following vulnerability has been resolved:

netfilter: nat: use kfreercu to release ops

Florian Westphal says:

"Historically this is not an issue, even for normal base hooks: the data path doesn't use the original nfhookops that are used to register the callbacks.

However, in v5.14 I added the ability to dump the active netfilter hooks from userspace.

This code will peek back into the nfhookops that are available at the tail of the pointer-array blob used by the datapath.

The nat hooks are special, because they are called indirectly from the central nat dispatcher hook. They are currently invisible to the nfnl hook dump subsystem though.

But once that changes the nat ops structures have to be deferred too."

Update nfnatregisterfn() to deal with partial exposition of the hooks from error path which can be also an issue for nfnetlinkhook.