[fetchmail][PATCH] avoid logging the wrong message on SMTP 4xx replies

This is a somewhat old patch I noticed was not in fetchmail yet (but I could
swear I sent it to Eric. Oh well...)

It fixed Debian bug #90966.

-- 
  "One disk to rule them all, One disk to find them. One disk to bring
  them all and in the darkness grind them. In the Land of Redmond
  where the shadows lie." -- The Silicon Valley Tarot
  Henrique Holschuh

sink.patch
Description: Text document