core: minor code refactor (ethereum#26852)

* core: refactor code

* core: drop it from this anonymous goroutine func

core/blockchain.go

@@ -1740,14 +1740,14 @@ func (bc *BlockChain) insertChain(chain types.Blocks, verifySeals, setHead bool)
 			if followup, err := it.peek(); followup != nil && err == nil {
 				throwaway, _ := state.New(parent.Root, bc.stateCache, bc.snaps)
 
-				go func(start time.Time, followup *types.Block, throwaway *state.StateDB, interrupt *uint32) {
+				go func(start time.Time, followup *types.Block, throwaway *state.StateDB) {
 					bc.prefetcher.Prefetch(followup, throwaway, bc.vmConfig, &followupInterrupt)
 
 					blockPrefetchExecuteTimer.Update(time.Since(start))
-					if atomic.LoadUint32(interrupt) == 1 {
+					if atomic.LoadUint32(&followupInterrupt) == 1 {
 						blockPrefetchInterruptMeter.Mark(1)
 					}
-				}(time.Now(), followup, throwaway, &followupInterrupt)
+				}(time.Now(), followup, throwaway)
 			}
 		}