Don't try to use -1 as a literal uint64_t.
Don't try to use -1 as a literal uint64_t.

clang doesn't like that very much.

Change-Id: I7d23f1aca6a570af4f303c51b905c130bcd899c3
Reviewed-on: http://review.membase.org/3213
Tested-by: Chiyoung Seo <8b279095f11c26cc21045fda5a3e51debb005aa9@gmail.com>
Reviewed-by: Chiyoung Seo <8b279095f11c26cc21045fda5a3e51debb005aa9@gmail.com>

daverigby/ep-engine,membase/ep-engine,teligent-ru/ep-engine,membase/ep-engine,couchbaselabs/ep-engine,couchbase/ep-engine,jimwwalker/ep-engine,daverigby/kv_engine,abhinavdangeti/ep-engine,zbase/ep-engine,hisundar/ep-engine,couchbaselabs/ep-engine,abhinavdangeti/ep-engine,sriganes/ep-engine,zbase/ep-engine,hisundar/ep-engine,couchbase/ep-engine,abhinavdangeti/ep-engine,abhinavdangeti/ep-engine,owendCB/ep-engine,couchbase/ep-engine,couchbaselabs/ep-engine,sriganes/ep-engine,zbase/ep-engine,zbase/ep-engine,teligent-ru/ep-engine,couchbaselabs/ep-engine,hisundar/ep-engine,daverigby/kv_engine,couchbase/ep-engine,jimwwalker/ep-engine,zbase/ep-engine,jimwwalker/ep-engine,teligent-ru/ep-engine,abhinavdangeti/ep-engine,owendCB/ep-engine,jimwwalker/ep-engine,owendCB/ep-engine,sriganes/ep-engine,couchbaselabs/ep-engine,daverigby/ep-engine,membase/ep-engine,daverigby/ep-engine,daverigby/ep-engine,owendCB/ep-engine,daverigby/kv_engine,sriganes/ep-engine,teligent-ru/ep-engine,hisundar/ep-engine,daverigby/kv_engine,membase/ep-engine