nft-shared: Drop unused function print_proto()

The last users vanished back in 2013. There is identical code in
save_rule_details(), but with only a single user there's not much point
in keeping the function.

Fixes: cdc78b1d6bd7b ("nft: convert rule into a command state structure")
Signed-off-by: Phil Sutter <phil@nwl.cc>
2 files changed