Fixed unused variable warning

collectagent/collectagent.cpp

@@ -851,7 +851,6 @@ int main(int argc, char* const argv[]) {
 
       gettimeofday(&start, NULL);
       uint64_t lastCleanup = start.tv_sec;
-      uint64_t lastStats = start.tv_sec;
       uint64_t sleepInterval = (settings.statisticsInterval > 0) ? settings.statisticsInterval : 60;
 
       LOG(info) << "Collect Agent running...";
@@ -877,7 +876,6 @@ int main(int argc, char* const argv[]) {
 	      msgCtr = 0;
 	      pmsgCtr = 0;
 	      readingCtr = 0;
-	      lastStats = start.tv_sec;
 	  }
       }