tests: Avoid exception in dbus_p2p_two_groups

Only run peerJoined() steps once to avoid trying to use GetAll() on an
already removed group and double-removal of a group. This did not make
the test case fail, but the exception is printed out in pretty confusing
way to stdout, so better get rid of it.

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>

tests/hwsim/test_dbus.py

@@ -4438,6 +4438,7 @@ def test_dbus_p2p_two_groups(dev, apdev):
             self.go = None
             self.group1 = None
             self.group2 = None
+            self.groups_removed = False
 
         def __enter__(self):
             gobject.timeout_add(1, self.run_test)
@@ -4542,6 +4543,8 @@ def test_dbus_p2p_two_groups(dev, apdev):
 
         def peerJoined(self, peer):
             logger.debug("peerJoined: " + peer)
+            if self.groups_removed:
+                return
             self.check_results()
 
             dev2 = WpaSupplicant('wlan2', '/tmp/wpas-wlan2')
@@ -4557,6 +4560,7 @@ def test_dbus_p2p_two_groups(dev, apdev):
             group_p2p = dbus.Interface(self.g1_if_obj,
                                        WPAS_DBUS_IFACE_P2PDEVICE)
             group_p2p.Disconnect()
+            self.groups_removed = True
 
         def check_results(self):
             logger.info("Check results with two concurrent groups in operation")