Merge pull request #531 from xujianhai666/fix-apache-retry

[ISSUE #530] fix: initialize 0 for retry topic when ConsumeFromLastOffst
diff --git a/consumer/consumer.go b/consumer/consumer.go
index 3129b8d..0a2f6d0 100644
--- a/consumer/consumer.go
+++ b/consumer/consumer.go
@@ -754,7 +754,7 @@
 		case ConsumeFromLastOffset:
 			if lastOffset == -1 {
 				if strings.HasPrefix(mq.Topic, internal.RetryGroupTopicPrefix) {
-					lastOffset = 0
+					result = 0
 				} else {
 					lastOffset, err := dc.queryMaxOffset(mq)
 					if err == nil {