common: fix compile warning for missing return.
common: fix compile warning for missing return.

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