4736.	[cleanup]	(a) Added comments to NSEC3-related functions in
			lib/dns/zone.c.  (b) Refactored NSEC3 salt formatting
			code.  (c) Minor tweaks to lock and result handling.
			[RT #46053]

9.9.12, 9.10.7, 9.11.3, 9.12.0