tests: Fix ap_ft_reassoc_replay for case where wlantest has the PSK

This test case was failing if wlantest was able to decrypt the CCMP
protected frames. Fix the tshark filter string to include only the
actually encrypted frames for PN comparison.

Signed-off-by: Jouni Malinen <j@w1.fi>

tests/hwsim/test_ap_ft.py

@@ -2738,7 +2738,8 @@ def test_ap_ft_reassoc_replay(dev, apdev, params):
     sta = dev[0].own_addr()
     filt = "wlan.fc.type == 2 && " + \
            "wlan.da == " + sta + " && " + \
-           "wlan.sa == " + ap
+           "wlan.sa == " + ap + " && " + \
+           "wlan.fc.protected == 1"
     fields = ["wlan.ccmp.extiv"]
     res = run_tshark(capfile, filt, fields)
     vals = res.splitlines()