build: fix govet lint errors with golangci-lint v1.60.1

There were a lot of instances of this lint error

    printf: non-constant format string in call to github.com/rclone/rclone/fs.Logf (govet)

Which were fixed by re-arranging the arguments and adding "%s".

There were quite a few genuine bugs which were found too.

cmd/serve/s3/logger.go

@@ -12,14 +12,25 @@ type logger struct{}
 
 // print log message
 func (l logger) Print(level gofakes3.LogLevel, v ...interface{}) {
+	var s string
+	if len(v) == 0 {
+		s = ""
+	} else {
+		var ok bool
+		s, ok = v[0].(string)
+		if !ok {
+			s = fmt.Sprint(v[0])
+		}
+		v = v[1:]
+	}
 	switch level {
 	default:
 		fallthrough
 	case gofakes3.LogErr:
-		fs.Errorf("serve s3", fmt.Sprintln(v...))
+		fs.Errorf("serve s3", s, v...)
 	case gofakes3.LogWarn:
-		fs.Infof("serve s3", fmt.Sprintln(v...))
+		fs.Infof("serve s3", s, v...)
 	case gofakes3.LogInfo:
-		fs.Debugf("serve s3", fmt.Sprintln(v...))
+		fs.Debugf("serve s3", s, v...)
 	}
 }

cmd/serve/s3/utils.go

@@ -3,7 +3,6 @@ package s3
 import (
 	"context"
 	"encoding/hex"
-	"fmt"
 	"io"
 	"os"
 	"path"
@@ -127,7 +126,7 @@ func authlistResolver(list []string) map[string]string {
 	for _, v := range list {
 		parts := strings.Split(v, ",")
 		if len(parts) != 2 {
-			fs.Infof(nil, fmt.Sprintf("Ignored: invalid auth pair %s", v))
+			fs.Infof(nil, "Ignored: invalid auth pair %s", v)
 			continue
 		}
 		authList[parts[0]] = parts[1]