P2P: Fix P2P_FLUSH clearing of p2p_go_avoid_freq

P2P_FLUSH command did not cleanly clear the p2p_go_avoid_freq data
structure, and left it in an inconsistent state, where the range field
was NULL but the num field was not 0. This would have resulted in an
invalid memory access in freq_range_list_includes().

Fix this.

Signed-off-by: Ilan Peer <ilan.peer@intel.com>

wpa_supplicant/ctrl_iface.c

@@ -6793,6 +6793,7 @@ static void wpa_supplicant_ctrl_iface_flush(struct wpa_supplicant *wpa_s)
 	p2p_wpa_s->p2p_disable_ip_addr_req = 0;
 	os_free(p2p_wpa_s->global->p2p_go_avoid_freq.range);
 	p2p_wpa_s->global->p2p_go_avoid_freq.range = NULL;
+	p2p_wpa_s->global->p2p_go_avoid_freq.num = 0;
 	p2p_wpa_s->global->pending_p2ps_group = 0;
 #endif /* CONFIG_P2P */