message: fix calculation of the image size
  required if the application based on more then one load section
diff: @@ -176,7 +176,7 @@ pub unsafe extern "C" fn loader_main() {
  }
  file_size = program_header.virt_addr + align_up!(program_header.file_size, BasePageSize::SIZE) - virtual_address;
  - mem_size += program_header.mem_size;
  + mem_size = program_header.virt_addr - virtual_address + program_header.mem_size;
  }
  }
  