fix: dupl on Windows

Author: ldez

pkg/golinters/dupl/dupl.go

@@ -3,6 +3,7 @@ package dupl
 import (
 	"fmt"
 	"go/token"
+	"strings"
 	"sync"
 
 	duplAPI "github.com/golangci/dupl"
@@ -68,6 +69,11 @@ func runDupl(pass *analysis.Pass, settings *config.DuplSettings) ([]goanalysis.I
 	res := make([]goanalysis.Issue, 0, len(issues))
 
 	for _, i := range issues {
+		// Related to Windows
+		if !strings.HasSuffix(i.To.Filename(), ".go") {
+			continue
+		}
+
 		toFilename, err := fsutils.ShortestRelPath(i.To.Filename(), "")
 		if err != nil {
 			return nil, fmt.Errorf("failed to get shortest rel path for %q: %w", i.To.Filename(), err)