Fix a typo syscanll.SIGTERM -> syscall.SIGTERM

[DeathKing]

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[codecov]

Codecov Report

Merging #1868 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1868   +/-   ##
=======================================
  Coverage   98.65%   98.65%           
=======================================
  Files          41       41           
  Lines        2149     2149           
=======================================
  Hits         2120     2120           
  Misses         18       18           
  Partials       11       11

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[thinkerou]

LGTM, thanks!