simple ordering fix to avoid gcc warning

Author: soumith

torch/lib/libshm/manager.cpp

@@ -26,8 +26,8 @@ const int SHUTDOWN_TIMEOUT = 2000; // 2s
 struct ClientSession {
  ClientSession(ManagerSocket s): socket(std::move(s)), pid(0) {}
 
- pid_t pid;
  ManagerSocket socket;
+ pid_t pid;
 };