l2geth: small syntax fix in the syncservice

Very minor fix to the syncservice

.changeset/ten-bugs-cheat.md

+---
+'@eth-optimism/l2geth': patch
+---
+
+Quick syntax fix in the sync service

l2geth/rollup/sync_service.go

@@ -1092,7 +1092,7 @@ func (s *SyncService) syncTransactionRange(start, end uint64, backend Backend) e
 		if err != nil {
 			return fmt.Errorf("cannot fetch transaction %d: %w", i, err)
 		}
-		if err = s.applyTransaction(tx); err != nil {
+		if err := s.applyTransaction(tx); err != nil {
 			return fmt.Errorf("Cannot apply transaction: %w", err)
 		}
 	}