wpa_gui: Increase control interface message buffer for LIST_NETWORKS

Double the buffer length from 2048 to 4096 to match the length used
currently in wpa_supplicant. This allows wpa_gui to retrieve information
for more networks than previously.

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

wpa_supplicant/wpa_gui-qt4/wpagui.cpp

@@ -639,7 +639,7 @@ void WpaGui::updateStatus()
 
 void WpaGui::updateNetworks()
 {
-	char buf[2048], *start, *end, *id, *ssid, *bssid, *flags;
+	char buf[4096], *start, *end, *id, *ssid, *bssid, *flags;
 	size_t len;
 	int first_active = -1;
 	int was_selected = -1;