small edit to binary_search
small edit to binary_search

--HG--
extra : convert_revision : svn%3A83215879-3e5a-4751-8c9d-778f44bb06a5/trunk%40390

mohamed-ali/thrust,marksantos/thrust,sdalton1/thrust,jaredhoberock/thrust,zhenglaizhang/thrust,xiongzhanblake/thrust,andrewcorrigan/thrust-multi-permutation-iterator,xiongzhanblake/thrust,Ricardo666666/thrust,xiongzhanblake/thrust_src,raygit/thrust,zhenglaizhang/thrust,dachziegel/thrust,GrimDerp/thrust,arnabgho/thrust,xiongzhanblake/thrust_src,egaburov/thrust,mohamed-ali/thrust,zeryx/thrust,mohamed-ali/thrust,raygit/thrust,thvasilo/thrust,andrewcorrigan/thrust-multi-permutation-iterator,raygit/thrust,sarvex/thrust,thvasilo/thrust,andrewcorrigan/thrust-multi-permutation-iterator,thrust/thrust,marksantos/thrust,sarvex/thrust,zhenglaizhang/thrust,egaburov/thrust,thrust/thrust,zeryx/thrust,Ricardo666666/thrust,egaburov/thrust,jaredhoberock/thrust,xiongzhanblake/thrust_src,arnabgho/thrust,zeryx/thrust,jaredhoberock/thrust,dachziegel/thrust,thrust/thrust,jaredhoberock/thrust,sdalton1/thrust,sdalton1/thrust,jaredhoberock/thrust,thvasilo/thrust,thrust/thrust,marksantos/thrust,sarvex/thrust,Ricardo666666/thrust,xiongzhanblake/thrust,dachziegel/thrust,GrimDerp/thrust,thrust/thrust,arnabgho/thrust,GrimDerp/thrust