src: netlink_delinearize: don't assume element contains a value

src: netlink_delinearize: don't assume element contains a value

We cannot assume i->key->key is EXPR_VALUE, we could look e.g.  at a range,
which will trigger an assertion failure in binop_adjust_one().

We should call __binop_adjust recursively again in the EXPR_SET_ELEM case,
using key as new input.

Fixes: b8b8e7b6ae10 ("evaluate: transfer right shifts to set reference side")
Signed-off-by: Florian Westphal <fw@strlen.de>