remove dead stores

Dead store	Dead increment	/lib/dns/message.c	1	Value stored to 'optlen' is never read	Details
Dead store	Dead increment	/lib/dns/message.c	1	Value stored to 'optlen' is never read	Details
Dead store	Dead increment	/lib/dns/message.c	1	Value stored to 'optlen' is never read	Details
Dead store	Dead increment	/lib/dns/message.c	1	Value stored to 'optlen' is never read	Details

Edited May 10, 2019 by Mark Andrews

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information