bugfix: gcc 4.6 complaint about comparing size_t values with off_t values.
bugfix: gcc 4.6 complaint about comparing size_t values with off_t values.

yeahdongcn/SEnginx,yeahdongcn/SEnginx,yeahdongcn/SEnginx,yeahdongcn/SEnginx,yeahdongcn/SEnginx,yeahdongcn/SEnginx,yeahdongcn/SEnginx