memory leak in keymgr when generating ECDSA keys
% keymgr zone key generate example algo ecdsap256sha256 size 256
id d60ee71bc14c184da1209e9ea6d942ff8c017367 keytag 17054
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==11496==ERROR: LeakSanitizer: detected memory leaks
Direct leak of 128 byte(s) in 4 object(s) allocated from:
#0 0x7f894d9dcf5e in realloc (/home/fcelda/devel/knot/src/dnssec/utils/.libs/lt-keymgr+0xa5f5e)
#1 0x7f894a46c803 in __gmp_default_reallocate (/lib64/libgmp.so.10+0xc803)
SUMMARY: AddressSanitizer: 128 byte(s) leaked in 4 allocation(s).