Fix gcc 4.6 compile error
Fix gcc 4.6 compile error

yeahdongcn/SEnginx,noname007/ngx_devel_kit,yeahdongcn/SEnginx,yeahdongcn/SEnginx,simpl/ngx_devel_kit,yeahdongcn/SEnginx,noname007/ngx_devel_kit,yeahdongcn/SEnginx,simpl/ngx_devel_kit,noname007/ngx_devel_kit,yeahdongcn/SEnginx,yeahdongcn/SEnginx,simpl/ngx_devel_kit