43568782c2 External input fund support cleanups (Gregory Sanders)
Pull request description:
Minor cleanups to https://github.com/bitcoin/bitcoin/pull/17211
ACKs for top commit:
achow101:
ACK 43568782c2
meshcollider:
utACK 43568782c2
benthecarman:
ACK 43568782c2
Tree-SHA512: 865f8a3804f8c0027f5393a0539041158166a919378f2c3bc99b936843eee2329372bcc2af888fa62babfa5f6baf4f13d4cfef7b4e26a7265a82a908f9719ad6