Remove unused Batch.resultsRead

batch.go

@@ -18,11 +18,10 @@ type batchItem struct {
 // Batch queries are a way of bundling multiple queries together to avoid
 // unnecessary network round trips.
 type Batch struct {
-	conn        *Conn
+	conn  *Conn
-	items       []*batchItem
+	items []*batchItem
-	resultsRead int
+	ctx   context.Context
-	ctx         context.Context
+	err   error
-	err         error
 
 	mrr *pgconn.MultiResultReader
 }