map: fix compile warning.
map: fix compile warning.

ApolloAuto/apollo,ycool/apollo,wanglei828/apollo,ycool/apollo,wanglei828/apollo,jinghaomiao/apollo,wanglei828/apollo,jinghaomiao/apollo,jinghaomiao/apollo,xiaoxq/apollo,xiaoxq/apollo,xiaoxq/apollo,ApolloAuto/apollo,wanglei828/apollo,xiaoxq/apollo,ycool/apollo,jinghaomiao/apollo,wanglei828/apollo,xiaoxq/apollo,ApolloAuto/apollo,jinghaomiao/apollo,xiaoxq/apollo,ApolloAuto/apollo,wanglei828/apollo,ycool/apollo,ycool/apollo,ApolloAuto/apollo,ycool/apollo,ApolloAuto/apollo,jinghaomiao/apollo