Convert errors tracer into a separate package (#5221)

cmd/object-api-utils.go

@@ -24,6 +24,7 @@ import (
 	"strings"
 	"unicode/utf8"
 
+	"github.com/minio/minio/pkg/errors"
 	"github.com/skyrings/skyring-common/tools/uuid"
 )
 
@@ -178,7 +179,7 @@ func getCompleteMultipartMD5(parts []CompletePart) (string, error) {
 	for _, part := range parts {
 		md5Bytes, err := hex.DecodeString(part.ETag)
 		if err != nil {
-			return "", traceError(err)
+			return "", errors.Trace(err)
 		}
 		finalMD5Bytes = append(finalMD5Bytes, md5Bytes...)
 	}