[PATCH nft 0/5] src: expr: reduce size of struct expr

[Florian Westphal <fw@xxxxxxxxx>]

This removes the 'expr_ops' pointer from the expr struct to
reduce its size.

Unfortunately, given each element in a set is backed by a expr struct,
nft might need several hundred mbytes worth of data during rule (set)
loading.

This reduces pressure a little.
Follopwup changes are possible (also in libnftnl).