4825.	[bug]		Prevent a bogus "error during managed-keys processing
			(no more)" warning from being logged. [RT #46645]

9.11.3, 9.12.0

(Skipped 9.9 and 9.10; even though the patch would apply cleanly, those
branches do not support "rndc managed-keys refresh", so I see no way
this bug could be triggered there.)