fix: broken gzip handling with Select API (#9128)

This PR fixes a regression introduced in a1c7c9ea73

pkg/s3select/progress.go

@@ -100,12 +100,13 @@ func newProgressReader(rc io.ReadCloser, compType CompressionType) (*progressRea
 	case noneType:
 		r = scannedReader
 	case gzipType:
-		if r, err = gzip.NewReader(scannedReader); err != nil {
+		r, err = gzip.NewReader(scannedReader)
+		if err != nil {
 			if errors.Is(err, gzip.ErrHeader) || errors.Is(err, gzip.ErrChecksum) {
 				return nil, errInvalidGZIPCompressionFormat(err)
 			}
-		}
 			return nil, errTruncatedInput(err)
+		}
 	case bzip2Type:
 		r = bzip2.NewReader(scannedReader)
 	default: