Clear SME auth_alg on FLUSH

This avoids a testing failure in the following test case sequence:
ap_ft_r1_key_expiration ap_open_external_assoc

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

wpa_supplicant/ctrl_iface.c

@@ -8136,6 +8136,7 @@ static void wpa_supplicant_ctrl_iface_flush(struct wpa_supplicant *wpa_s)
 
 #ifdef CONFIG_SME
 	wpa_s->sme.last_unprot_disconnect.sec = 0;
+	wpa_s->sme.auth_alg = 0;
 #endif /* CONFIG_SME */
 
 	wpabuf_free(wpa_s->ric_ies);