rndc-confgen -a segfaults on riscv64

From the testing/dnssec-tools build log:

(52/106) Installing bind (9.16.18-r2)
Executing bind-9.16.18-r2.pre-install
Executing bind-9.16.18-r2.post-install
Segmentation fault (core dumped)
chown: /etc/bind/rndc.key: No such file or directory
ERROR: bind-9.16.18-r2.post-install: script exited with error 1

Since /etc/bind/rndc.key doesn't exist afterwards, it seems rndc-confgen -a (as invoked by the post-install script) segfaults. Unfortunately, by simply running rndc-confgen -a in my Alpine riscv64 qemu-user chroot I cannot reproduce the segfault. Might be racy.

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