swarm/storage: fix influxdb gc metrics report (ethereum#19102)

(cherry picked from commit 5b8ae78)

Author: acud

swarm/storage/ldbstore.go

@@ -317,7 +317,6 @@ func decodeData(addr Address, data []byte) (*chunk, error) {
 }
 
 func (s *LDBStore) collectGarbage() error {
-
 	// prevent duplicate gc from starting when one is already running
 	select {
 	case <-s.gc.runC:
@@ -335,7 +334,6 @@ func (s *LDBStore) collectGarbage() error {
 	s.startGC(int(entryCnt))
 	log.Debug("collectGarbage", "target", s.gc.target, "entryCnt", entryCnt)
 
-	var totalDeleted int
 	for s.gc.count < s.gc.target {
 		it := s.db.NewIterator()
 		ok := it.Seek([]byte{keyGCIdx})
@@ -371,15 +369,15 @@ func (s *LDBStore) collectGarbage() error {
 		}
 
 		s.writeBatch(s.gc.batch, wEntryCnt)
+		log.Trace("garbage collect batch done", "batch", singleIterationCount, "total", s.gc.count)
 		s.lock.Unlock()
 		it.Release()
-		log.Trace("garbage collect batch done", "batch", singleIterationCount, "total", s.gc.count)
 	}
 
-	s.gc.runC <- struct{}{}
+	metrics.GetOrRegisterCounter("ldbstore.collectgarbage.delete", nil).Inc(int64(s.gc.count))
 	log.Debug("garbage collect done", "c", s.gc.count)
+	s.gc.runC <- struct{}{}
 
-	metrics.GetOrRegisterCounter("ldbstore.collectgarbage.delete", nil).Inc(int64(totalDeleted))
 	return nil
 }