Fix the in method restoreInvariants of AbstractRpcLogSender.

Author: Davidhua1996

streamis-jobmanager/streamis-job-log/job-log-collector/streamis-job-log-collector-core/src/main/java/com/webank/wedatasphere/streamis/jobmanager/log/collector/sender/AbstractRpcLogSender.java

@@ -435,7 +435,8 @@ private void restoreInvariants(int i, int take, boolean clearItems){
             this.count -= i;
             if (clearItems){
                 int index = this.takeIndex;
-                for (; i > 0; i --){
+                int j = i;
+                for (; j > 0; j --){
                     this.items[index] = null;
                     if (++index == items.length){
                         index = 0;