Makefile: Move to golangci-lint

Makefile

@@ -10,17 +10,8 @@ race:
 fmt:
 	!(gofmt -l -s -d $(shell find . -name \*.go) | grep '[a-z]')
 
-# go get honnef.co/go/tools/simple
-gosimple:
-	gosimple ./...
-
-# go get honnef.co/go/tools/unused
-unused:
-	unused ./...
-
-# go get github.com/kisielk/errcheck
-errcheck:
-	@errcheck -ignorepkg=bytes -ignore=os:Remove go.etcd.io/bbolt
+lint:
+	golangci-lint run ./...
 
 test:
 	TEST_FREELIST_TYPE=hashmap go test -timeout 20m -v -coverprofile cover.out -covermode atomic
@@ -33,4 +24,4 @@ test:
 	# Note: gets "program not an importable package" in out of path builds
 	@TEST_FREELIST_TYPE=array go test -v ./cmd/bbolt
 
-.PHONY: race fmt errcheck test gosimple unused
+.PHONY: race fmt test lint

db_test.go

@@ -30,7 +30,7 @@ const pageHeaderSize = 16
 
 // meta represents a simplified version of a database meta page for testing.
 type meta struct {
-	magic    uint32
+	_        uint32
 	version  uint32
 	_        uint32
 	_        uint32
@@ -38,7 +38,7 @@ type meta struct {
 	_        uint64
 	pgid     uint64
 	_        uint64
-	checksum uint64
+	_        uint64
 }
 
 // Ensure that a database can be opened without error.