LeakSanitizer: detected memory leaks

lib/isc/tests/lex_test.c reports:

=================================================================
==897==ERROR: LeakSanitizer: detected memory leaks

Direct leak of 658 byte(s) in 2 object(s) allocated from:
    #0 0x7f58a314ced0 in malloc (/lib/x86_64-linux-gnu/libasan.so.5+0xe8ed0)
    #1 0x7f58a2d5e08f in default_memalloc /builds/isc-private/bind9/lib/isc/mem.c:720

Indirect leak of 4440 byte(s) in 10 object(s) allocated from:
    #0 0x7f58a314ced0 in malloc (/lib/x86_64-linux-gnu/libasan.so.5+0xe8ed0)
    #1 0x7f58a2d5e08f in default_memalloc /builds/isc-private/bind9/lib/isc/mem.c:720

SUMMARY: AddressSanitizer: 5098 byte(s) leaked in 12 allocation(s).

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