Fix deadlock when stopping or restarting steam

Author: coldfix

steam_acolyte/steam_linux.py

@@ -145,7 +145,7 @@ def wait_for_steam_exit(self):
         # non-child processes, and the alternatives using the ptrace, inotifyd
         # or netlink interfaces are much more involved.
         pid = self._read_steam_pid()
-        while is_process_running(pid):
+        while pid and is_process_running(pid):
             sleep(0.010)
 
     @trace.method

steam_acolyte/steam_win32.py

@@ -78,7 +78,7 @@ def set_last_user(self, username):
     @trace.method
     def _is_steam_pid_valid(self):
         pid = reg.QueryValueEx(self._ipc_key, 'SteamPID')[0]
-        return pid != 0 and is_process_running(pid)
+        return pid and is_process_running(pid)
 
     @trace.method
     def _set_steam_pid(self):