netfilter: nftables: fix a warning message in nf_tables_commit_audit_collect()

netfilter: nftables: fix a warning message in nf_tables_commit_audit_collect()

The first argument of a WARN_ONCE() is a condition.  This WARN_ONCE()
will only print the table name, and is potentially problematic if the
table name has a %s in it.

Fixes: c520292f29b8 ("audit: log nftables configuration change events once per table")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Paul Moore <paul@paul-moore.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>