hastd: zombies after hooks

[Mikolaj Golub]

Hi,

After recent changes hastd does not garbage collect finished hooks leaving
zombies and messages in log like below:

Oct  3 18:21:05 bolek hastd[5144]: Hook is running for 1330 seconds (pid=5223, cmd=[/usr/bin/true connect storage]).

This is because wait3() in hook_check() is never called (we never call
hook_check(true)). Below is a patch that works for me. 

-- 
Mikolaj Golub

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