staticcheck (#313)

* CI: use staticcheck for linting

This commit switches the linter for Go code from golint to staticcheck.
Golint has been deprecated since last year and staticcheck is a
recommended replacement.

Signed-off-by: Lucas Servén Marín <lserven@gmail.com>

* revendor

Signed-off-by: Lucas Servén Marín <lserven@gmail.com>

* cmd,pkg: fix lint warnings

Signed-off-by: Lucas Servén Marín <lserven@gmail.com>

vendor/honnef.co/go/tools/lintcmd/runner/stats.go

@@ -0,0 +1,49 @@
+package runner
+
+import (
+	"sync/atomic"
+	"time"
+
+	"honnef.co/go/tools/go/loader"
+
+	"golang.org/x/tools/go/analysis"
+)
+
+const (
+	StateInitializing = iota
+	StateLoadPackageGraph
+	StateBuildActionGraph
+	StateProcessing
+	StateFinalizing
+)
+
+type Stats struct {
+	state                    uint32
+	initialPackages          uint32
+	totalPackages            uint32
+	processedPackages        uint32
+	processedInitialPackages uint32
+
+	// optional function to call every time an analyzer has finished analyzing a package.
+	PrintAnalyzerMeasurement func(*analysis.Analyzer, *loader.PackageSpec, time.Duration)
+}
+
+func (s *Stats) setState(state uint32)    { atomic.StoreUint32(&s.state, state) }
+func (s *Stats) State() int               { return int(atomic.LoadUint32(&s.state)) }
+func (s *Stats) setInitialPackages(n int) { atomic.StoreUint32(&s.initialPackages, uint32(n)) }
+func (s *Stats) InitialPackages() int     { return int(atomic.LoadUint32(&s.initialPackages)) }
+func (s *Stats) setTotalPackages(n int)   { atomic.StoreUint32(&s.totalPackages, uint32(n)) }
+func (s *Stats) TotalPackages() int       { return int(atomic.LoadUint32(&s.totalPackages)) }
+
+func (s *Stats) finishPackage()         { atomic.AddUint32(&s.processedPackages, 1) }
+func (s *Stats) finishInitialPackage()  { atomic.AddUint32(&s.processedInitialPackages, 1) }
+func (s *Stats) ProcessedPackages() int { return int(atomic.LoadUint32(&s.processedPackages)) }
+func (s *Stats) ProcessedInitialPackages() int {
+	return int(atomic.LoadUint32(&s.processedInitialPackages))
+}
+
+func (s *Stats) measureAnalyzer(analysis *analysis.Analyzer, pkg *loader.PackageSpec, d time.Duration) {
+	if s.PrintAnalyzerMeasurement != nil {
+		s.PrintAnalyzerMeasurement(analysis, pkg, d)
+	}
+}