core: add some blank lines in maintainTxIndex

core/blockchain.go

@@ -2283,6 +2283,7 @@ func (bc *BlockChain) futureBlocksLoop() {
 // the extra indices.
 func (bc *BlockChain) maintainTxIndex(ancients uint64) {
 	defer bc.wg.Done()
+
 	// Before starting the actual maintenance, we need to handle a special case,
 	// where user might init Geth with an external ancient database. If so, we
 	// need to reindex all necessary transactions before starting to process any
@@ -2294,6 +2295,7 @@ func (bc *BlockChain) maintainTxIndex(ancients uint64) {
 		}
 		rawdb.IndexTransactions(bc.db, from, ancients, bc.quit)
 	}
+
 	// indexBlocks reindexes or unindexes transactions depending on user configuration
 	indexBlocks := func(tail *uint64, head uint64, done chan struct{}) {
 		defer func() { done <- struct{}{} }()
@@ -2326,6 +2328,7 @@ func (bc *BlockChain) maintainTxIndex(ancients uint64) {
 			rawdb.UnindexTransactions(bc.db, *tail, head-bc.txLookupLimit+1, bc.quit)
 		}
 	}
+
 	// Any reindexing done, start listening to chain events and moving the index window
 	var (
 		done   chan struct{}                  // Non-nil if background unindexing or reindexing routine is active.