tests: fst_test_common: Remove dead code from HapdRegCtrl

Since refcnt is never incremented, this is dead code, just remove it.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>

tests/hwsim/fst_test_common.py

@@ -24,14 +24,9 @@ fst_test_def_reg_domain = '00'
 
 class HapdRegCtrl:
     def __init__(self):
-        self.refcnt = 0
         self.ifname = None
         self.changed = False
 
-    def __del__(self):
-        if self.refcnt != 0 and self.changed == True:
-            self.restore_reg_domain()
-
     def start(self):
         if self.ifname != None:
              hapd = hostapd.Hostapd(self.ifname)