fixed invalid iterator reference in generic::exclusive_segmented_scan
fixed invalid iterator reference in generic::exclusive_segmented_scan

--HG--
extra : convert_revision : svn%3A83215879-3e5a-4751-8c9d-778f44bb06a5/trunk%40682

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