Mark Johnston 618703b57b Fix a dead store.
We would fail to clear DNS search list configuration if a router
stopped specifying the DNSSL RA option.  I suspect that the bug
was mostly harmless, as the RDNSS and DNSSL options are typically used
together and omitting the RDNSS option would have the same effect.

CID:		1006219
MFC after:	2 weeks
Sponsored by:	The FreeBSD Foundation
2018-10-20 18:00:13 +00:00
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