netfilter: ipset: adding ranges to hash types with timeout could still fail, fixed

The patch "Fix adding ranges to hash types" had got a mistypeing
in the timeout variant of the hash types, which actually made
the patch ineffective. Fixed!

Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Signed-off-by: Patrick McHardy <kaber@trash.net>