Handle cleared pool more specifically
Handle cleared pool more specifically

This avoids some dirty pointer calculations when we know one
of them is null.

zander/bitcoinclassic,zander/bitcoinclassic,bitcoinclassic/bitcoinclassic,bitcoinclassic/bitcoinclassic,bitcoinclassic/bitcoinclassic,adpg211/bitcoin-master,adpg211/bitcoin-master,bitcoinclassic/bitcoinclassic,adpg211/bitcoin-master,deadalnix/bitcoin,adpg211/bitcoin-master,bitcoinclassic/bitcoinclassic,bitcoinclassic/bitcoinclassic,adpg211/bitcoin-master,deadalnix/bitcoin,deadalnix/bitcoin,zander/bitcoinclassic,deadalnix/bitcoin,deadalnix/bitcoin,deadalnix/bitcoin,adpg211/bitcoin-master,zander/bitcoinclassic,zander/bitcoinclassic,zander/bitcoinclassic