cmd/bootnode: fix timer leak

[ucwong]

No description provided.

[codecov]

Codecov Report

Merging #1658 (6b3b4ff) into master (ad35076) will increase coverage by 0.03%.
Report is 2 commits behind head on master.
The diff coverage is n/a.

❗ Current head 6b3b4ff differs from pull request most recent head 73ceae2. Consider uploading reports for the commit 73ceae2 to get more accurate results

@@            Coverage Diff             @@
##           master    #1658      +/-   ##
==========================================
+ Coverage   52.56%   52.59%   +0.03%     
==========================================
  Files         481      481              
  Lines       60234    60234              
==========================================
+ Hits        31659    31683      +24     
+ Misses      26161    26136      -25     
- Partials     2414     2415       +1     

see 15 files with indirect coverage changes