Revert "cmd/utils: report the blocknumber when block import fails (et…

…hereum#27213)"

This reverts commit c62da24.

cmd/utils/cmd.go

@@ -214,14 +214,8 @@ func ImportChain(chain *core.BlockChain, fn string) error {
 			log.Info("Skipping batch as all blocks present", "batch", batch, "first", blocks[0].Hash(), "last", blocks[i-1].Hash())
 			continue
 		}
-		if failindex, err := chain.InsertChain(missing); err != nil {
-			var failnumber uint64
-			if failindex > 0 && failindex < len(missing) {
-				failnumber = missing[failindex].NumberU64()
-			} else {
-				failnumber = missing[0].NumberU64()
-			}
-			return fmt.Errorf("invalid block %d: %v", failnumber, err)
+		if _, err := chain.InsertChain(missing); err != nil {
+			return fmt.Errorf("invalid block %d: %v", n, err)
 		}
 	}
 	return nil