Fix build for gcc
Fix build for gcc

Introduced in 6637dd8; not caught because clang didn't yell about this
issue.

catroot/rethinkdb,bchavez/rethinkdb,JackieXie168/rethinkdb,Qinusty/rethinkdb,catroot/rethinkdb,bchavez/rethinkdb,eliangidoni/rethinkdb,dparnell/rethinkdb,robertjpayne/rethinkdb,JackieXie168/rethinkdb,Qinusty/rethinkdb,niieani/rethinkdb,catroot/rethinkdb,Qinusty/rethinkdb,niieani/rethinkdb,robertjpayne/rethinkdb,bchavez/rethinkdb,eliangidoni/rethinkdb,eliangidoni/rethinkdb,catroot/rethinkdb,eliangidoni/rethinkdb,bchavez/rethinkdb,catroot/rethinkdb,bchavez/rethinkdb,niieani/rethinkdb,robertjpayne/rethinkdb,JackieXie168/rethinkdb,robertjpayne/rethinkdb,eliangidoni/rethinkdb,dparnell/rethinkdb,JackieXie168/rethinkdb,dparnell/rethinkdb,Qinusty/rethinkdb,catroot/rethinkdb,jmptrader/rethinkdb,JackieXie168/rethinkdb,grandquista/rethinkdb,Qinusty/rethinkdb,robertjpayne/rethinkdb,eliangidoni/rethinkdb,bpradipt/rethinkdb,dparnell/rethinkdb,robertjpayne/rethinkdb,mbroadst/rethinkdb,mbroadst/rethinkdb,niieani/rethinkdb,bpradipt/rethinkdb,grandquista/rethinkdb,mbroadst/rethinkdb,eliangidoni/rethinkdb,bchavez/rethinkdb,dparnell/rethinkdb,dparnell/rethinkdb,grandquista/rethinkdb,dparnell/rethinkdb,JackieXie168/rethinkdb,bpradipt/rethinkdb,bpradipt/rethinkdb,mbroadst/rethinkdb,bpradipt/rethinkdb,niieani/rethinkdb,robertjpayne/rethinkdb,grandquista/rethinkdb,mbroadst/rethinkdb,bpradipt/rethinkdb,Qinusty/rethinkdb,mbroadst/rethinkdb,jmptrader/rethinkdb,jmptrader/rethinkdb,jmptrader/rethinkdb,Qinusty/rethinkdb,catroot/rethinkdb,grandquista/rethinkdb,grandquista/rethinkdb,dparnell/rethinkdb,Qinusty/rethinkdb,grandquista/rethinkdb,mbroadst/rethinkdb,eliangidoni/rethinkdb,mbroadst/rethinkdb,jmptrader/rethinkdb,niieani/rethinkdb,bchavez/rethinkdb,bchavez/rethinkdb,JackieXie168/rethinkdb,bpradipt/rethinkdb,bchavez/rethinkdb,grandquista/rethinkdb,JackieXie168/rethinkdb,eliangidoni/rethinkdb,robertjpayne/rethinkdb,jmptrader/rethinkdb,jmptrader/rethinkdb,dparnell/rethinkdb,niieani/rethinkdb,niieani/rethinkdb,bpradipt/rethinkdb,catroot/rethinkdb,grandquista/rethinkdb,Qinusty/rethinkdb,bpradipt/rethinkdb,mbroadst/rethinkdb,JackieXie168/rethinkdb,jmptrader/rethinkdb,robertjpayne/rethinkdb