Simplify IP header size checking (don't use Ryu to calculate header size - hard code).
Simplify IP header size checking (don't use Ryu to calculate header size - hard code).

gizmoguy/faucet,trentindav/faucet,wackerly/faucet,anarkiwi/faucet,shivarammysore/faucet,trungdtbk/faucet,mwutzke/faucet,trentindav/faucet,faucetsdn/faucet,mwutzke/faucet,trungdtbk/faucet,shivarammysore/faucet,REANNZ/faucet,wackerly/faucet,faucetsdn/faucet,anarkiwi/faucet,REANNZ/faucet,gizmoguy/faucet