When zapping v_cache_dd for !MAKEENTRY case in cache_lookup(), we shall lock cache as writer.
When zapping v_cache_dd for !MAKEENTRY case in cache_lookup(), we shall
lock cache as writer.

Reviewed by:	kan

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase