src: revert hashtable for expression handlers

Partially revert 913979f882d1 ("src: add expression handler hashtable")
which is causing a crash with two instances of the nftables handler.

$ sudo python
[sudo] password for echerkashin:
Python 3.9.7 (default, Sep  3 2021, 06:18:44)
[GCC 11.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from nftables import Nftables
>>> n1=Nftables()
>>> n2=Nftables()
>>> <Ctrl-D>
double free or corruption (top)
Aborted

Reported-by: Eugene Crosser <crosser@average.org>
Suggested-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

0 files changed, 0 insertions, 0 deletions