ctx->chain may be null now that we have very large object names,
so we cannot check for ctx->chain[0] here.
Fixes: b7263e071aba7 ("netfilter: nf_tables: Allow table names of up to 255 chars") Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org> Acked-by: Phil Sutter <phil@nwl.cc>