extensions: NETMAP: fix iptables-save output

extensions: NETMAP: fix iptables-save output

NETMAP_print is also used by its .save hook so this change
broke iptables-save output.

Revert the patch, rename NETMAP_print to __NETMAP_print and
use that as the workhorse for both xtables -L and xtables-save.

The addition of the 'to' prefix is done in the .print hook only.

Reported-by: Shivani Bhardwaj <shivanib134@gmail.com>
Reported-by: Pablo Neira Ayuso <pablo@netfilter.org>
Fixes: 90becf12bd5823b6d59d32d ("extensions: NETMAP: add ' to:' prefix when printing NETMAP target")
Signed-off-by: Florian Westphal <fw@strlen.de>