crypto: automatically manage memory for ECDSA_SIG
requested to merge github/fork/tniessen/crypto-use-automatic-memory-management-for-ecdsasig into master
As suggested by @bnoordhuis in https://github.com/nodejs/node/pull/29292.
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
commit message follows commit guidelines