rdata unit test fails on OpenBSD 7.1 in "key" and "sig_rrsig" tests

The rdata_test unit test fails on OpenBSD 7.1 with Clang 13.0.0 on main (and only there) and thus prevents updating to the new release (isc-projects/images!163):

[==========] Running 27 test(s).
[ RUN      ] amtrelay
[       OK ] amtrelay
[ RUN      ] apl
[       OK ] apl
[ RUN      ] atma
[       OK ] atma
[ RUN      ] cdnskey
[       OK ] cdnskey
[ RUN      ] csync
[       OK ] csync
[ RUN      ] dnskey
[       OK ] dnskey
[ RUN      ] doa
[       OK ] doa
[ RUN      ] ds
[       OK ] ds
[ RUN      ] eid
[       OK ] eid
[ RUN      ] hip
[       OK ] hip
[ RUN      ] https_svcb
[       OK ] https_svcb
[ RUN      ] isdn
[       OK ] isdn
[ RUN      ] key
[  ERROR   ] --- 0 == 0
[   LINE   ] --- rdata_test.c:410: error: Failure!
[  FAILED  ] key
[ RUN      ] loc
[       OK ] loc
[ RUN      ] nimloc
[       OK ] nimloc
[ RUN      ] nsec
[       OK ] nsec
[ RUN      ] nsec3
[       OK ] nsec3
[ RUN      ] nxt
[       OK ] nxt
[ RUN      ] rkey
[       OK ] rkey
[ RUN      ] sig_rrsig
[  ERROR   ] --- 0 == 0
[   LINE   ] --- rdata_test.c:410: error: Failure!
[  FAILED  ] sig_rrsig
[ RUN      ] sshfp
[       OK ] sshfp
[ RUN      ] wks
[       OK ] wks
[ RUN      ] zonemd
[       OK ] zonemd
[ RUN      ] edns_client_subnet
[       OK ] edns_client_subnet
[ RUN      ] atcname
[       OK ] atcname
[ RUN      ] atparent
[       OK ] atparent
[ RUN      ] iszonecutauth
[       OK ] iszonecutauth
[==========] 27 test(s) run.
[  PASSED  ] 25 test(s).
[  FAILED  ] 2 test(s), listed below:
[  FAILED  ] key
[  FAILED  ] sig_rrsig

 2 FAILED TEST(S)
FAIL rdata_test (exit status: 2)