netfilter: return booleans instead of integers

Return statements in functions returning bool should use
true/false instead of 1/0.

These issues were detected with the help of Coccinelle.

Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
3 files changed