There is a `strdup` at the beginning of `create_stack`. If it fails, an
empty log-line is printed. It's not useful, so remove it. This is
consistent with the error-handling of the `malloc` which immediately
follows it.
Signed-off-by: Jeremy Sowden <jeremy@azazel.net> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>