md_crypt: Fix potential memory leak with openssl < 3. #572

Job	Run time
Empty APLOGNO() test	31s
Default	4m 8s
All-static modules	3m 59s
Prefork MPM, all-modules (except cgid)	4m 13s
Worker MPM, all-modules	4m 51s
Shared MPMs, all-modules	4m 42s
Event MPM, all-modules, mod_cgid only	6m 6s
Event MPM, all-modules, no CMSG_DATA	3m 58s
Default, all-modules + install	4m 25s
Default, all-modules, random test order	5m 42s
GCC 10 maintainer-mode w/-Werror, install + VPATH	3m 8s
All-modules, APR 1.7.4, APR-util 1.6.3	6m 58s
APR 1.8.x, APR-util 1.7.x	7m 56s
Pool-debug	6m 54s
Shared MPMs (event), pool-debug, SSL/TLS variants	10m 5s
Shared MPMs (worker), pool-debug, SSL/TLS variants	10m 22s
Shared MPMs (prefork), pool-debug, SSL/TLS variants	11m 35s
litmus WebDAV tests	2m 45s
litmus WebDAV tests, APR trunk, LMDB	3m 8s
Regenerate ap_expr	5m 42s
APR 1.7.4, APR-util 1.6.3, LDAP	5m 27s
APR trunk thread debugging	6m 9s
UBSan	6m 56s
ASan	8m 59s
ASan, pool-debug	7m 6s
HTTP/2 test suite	12m 2s
MOD_TLS test suite	6m 17s
	2h 44m 4s

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