Subject: free the hashlist when exiting.
From: marka@isc.org
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Date: Wed, 06 Dec 2017 18:58:11 -1000
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==23589==ERROR: LeakSanitizer: detected memory leaks

Direct leak of 42 byte(s) in 1 object(s) allocated from:
    #0 0x7f8f47f10602 in malloc (/usr/lib/x86_64-linux-gnu/libasan.so.2+0x98602)
    #1 0x42ccf9 in hashlist_init dnssec-signzone.c:710
    #2 0x42ccf9 in main dnssec-signzone.c:3716

SUMMARY: AddressSanitizer: 42 byte(s) leaked in 1 allocation(s).