Fix linting issues

Author: oschwald

reader.go

@@ -135,13 +135,13 @@ type mmapCleanup struct {
 // All of the methods on Reader are thread-safe. The struct may be safely
 // shared across goroutines.
 type Reader struct {
-	buffer            []byte
+	hasMappedFile     *atomic.Bool
 	decoder           decoder.ReflectionDecoder
+	buffer            []byte
 	Metadata          Metadata
 	ipv4Start         uint
 	ipv4StartBitDepth int
 	nodeOffsetMult    uint
-	hasMappedFile     *atomic.Bool
 }
 
 // Metadata holds the metadata decoded from the MaxMind DB file.

reader_test.go

@@ -78,7 +78,7 @@ func TestReaderLeaks(t *testing.T) {
 		// We intentionally do NOT call Close() to test if GC picks it up
 		// and if AddCleanup doesn't prevent it.
 
-		runtime.SetFinalizer(r, func(obj *Reader) {
+		runtime.SetFinalizer(r, func(*Reader) {
 			close(collected)
 		})
 	}()