The San Jose Sharks had their losing streak extended to six games on Wednesday and once again a disastrous second period proved to be the main culprit. Leading by one, the Sharks allowed three unanswered goals in the second period, including two in 13 seconds, in what became a 5-1 loss to the Los Angeles Kings at Crypto.com Arena. Fabian Zetterlund scored his 10th of the season in a first-period goal as San Jose took its first lead in a game since beating the Winnipeg Jets 2-1 on Dec. 12. But the Kings capitalized on two Sharks turnovers near the start of the second period to take a 2-1 lead. …