zlib: fix memory leak for unused zlib instances #21607
Merged
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An oversight in an earlier commit led to a memory leak
in the untypical situation that zlib instances are created
but never used, because zlib handles no longer started
out their life as weak handles.
The bug was introduced in bd20110.
Refs: #20455
Checklist
make -j4 test
(UNIX), orvcbuild test
(Windows) passes