more linter fixes

cmd/devp2p/internal/ethtest/large.go

cmd/utils/diskusage.go

common/types_test.go

core/rawdb/accessors_chain.go

core/state_prefetcher.go

core/state_processor_test.go

eth/downloader/downloader_test.go

eth/downloader/queue_test.go

eth/handler.go

eth/handler_eth.go

eth/peerset.go

eth/protocols/eth/handler.go

eth/protocols/eth/handlers.go

eth/protocols/eth/peer.go

eth/sync.go

signer/core/api.go