Dont persist config on failure

If soft AP bring up does not go through successfully,
dont persist the config. This has the benefit of recovering
from the case where things fail on "=" and "," for SSID since
the IOCTL parsing in driver on broadcom cannot handle it
at this time.

Change-Id: Iaa60fd05972db434500753dcb59092995dab07b1

services/java/com/android/server/WifiService.java

@@ -679,9 +679,9 @@ public class WifiService extends IWifiManager.Stub {
             /* Configuration changed on a running access point */
             if(enable && (wifiConfig != null)) {
                 try {
-                    persistApConfiguration(wifiConfig);
                     nwService.setAccessPoint(wifiConfig, mWifiStateTracker.getInterfaceName(),
                                              SOFTAP_IFACE);
+                    persistApConfiguration(wifiConfig);
                     return true;
                 } catch(Exception e) {
                     Slog.e(TAG, "Exception in nwService during AP restart");
@@ -717,7 +717,6 @@ public class WifiService extends IWifiManager.Stub {
                 wifiConfig.SSID = mContext.getString(R.string.wifi_tether_configure_ssid_default);
                 wifiConfig.allowedKeyManagement.set(KeyMgmt.NONE);
             }
-            persistApConfiguration(wifiConfig);
 
             if (!mWifiStateTracker.loadDriver()) {
                 Slog.e(TAG, "Failed to load Wi-Fi driver for AP mode");
@@ -734,6 +733,8 @@ public class WifiService extends IWifiManager.Stub {
                 return false;
             }
 
+            persistApConfiguration(wifiConfig);
+
         } else {
 
             try {