Correctly handle IPv4 route specified as either 10.1.2.0/255.255.255.0 or 10.1.2.0/24
The existing process_split_xxclude() only handles IPv4 routes
formatted as "10.1.2.0/255.255.255.0", not those formatted as
"10.1.2.0/24".
It's possible to unambiguously distinguish the two and handle the
latter case correctly, because no IPv4 netmask address can possibly
have a decimal integer value <= 32.
Signed-off-by: Daniel Lenski <dlenski@gmail.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org>