Github user shinrich commented on the issue:
https://github.com/apache/trafficserver/pull/853
The add1 version increments the reference count of the certificate, The
add0 version doesn't, so it effectively takes ownership of the reference you
pass in. From the man page
"All these functions are implemented as macros. Those containing a 1
increment the reference count of the supplied certificate or chain so it must
be freed at some point after the operation. Those containing a 0 do not
increment reference counts and the supplied certificate or chain MUST NOT be
freed after the operation."
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