[inst/mc] Fix coding style for memcache_hit?
[inst/mc] Fix coding style for memcache_hit?

Don't use not, use trinary operator instead.

appneta/ruby-traceview,tlunter/oboe-ruby,boyang-li/oboe-ruby,tlunter/oboe-ruby,boyang-li/oboe-ruby,boyang-li/oboe-ruby,tlunter/oboe-ruby,tlunter/oboe-ruby,boyang-li/oboe-ruby,appneta/ruby-traceview,appneta/ruby-traceview,appneta/ruby-traceview