BUG#21799 manual modify variable name.

storage/ndb/src/ndbapi/NdbScanOperation.cpp:
  manual modify variable name.

storage/ndb/src/ndbapi/NdbScanOperation.cpp

@@ -525,7 +525,7 @@ int NdbScanOperation::nextResultImpl(bool fetchAllowed, bool forceSend)
         int ret_code= poll_guard.wait_scan(3*timeout, nodeId, forceSend);
 	if (ret_code == 0 && seq == tp->getNodeSequence(nodeId)) {
 	  continue;
-	} else if(return_code == -1){
+	} else if(ret_code == -1){
 	  retVal = -1;
 	} else {
 	  idx = last;
@@ -1438,7 +1438,7 @@ NdbIndexScanOperation::next_result_ordered(bool fetchAllowed,
 	    continue;
 	  }
 	  if(DEBUG_NEXT_RESULT) ndbout_c("return -1");
-	  if(return_code == -1){
+	  if(ret_code == -1){
 	    setErrorCode(4008);
 	  } else {
 	    setErrorCode(4028);