use String return for both SSID functions

Author: pgollor

libraries/ESP8266WiFi/src/ESP8266WiFi.cpp

@@ -536,13 +536,13 @@ void * ESP8266WiFiClass::_getScanInfoByIndex(int i)
     return reinterpret_cast<bss_info*>(ESP8266WiFiClass::_scanResult) + i;
 }
 
-const char* ESP8266WiFiClass::SSID(uint8_t i)
+String ESP8266WiFiClass::SSID(uint8_t i)
 {
     struct bss_info* it = reinterpret_cast<struct bss_info*>(_getScanInfoByIndex(i));
     if (!it)
-        return 0;
+        return "";
 
-    return reinterpret_cast<const char*>(it->ssid);
+    return String(reinterpret_cast<const char*>(it->ssid));
 }
 
 uint8_t * ESP8266WiFiClass::BSSID(uint8_t i)

libraries/ESP8266WiFi/src/ESP8266WiFi.h

@@ -239,7 +239,7 @@ class ESP8266WiFiClass
 	 *
      * return: ssid string of the specified item on the networks scanned list
      */
-    const char*	SSID(uint8_t networkItem);
+    String SSID(uint8_t networkItem);
 
     /*
      * Return the encryption type of the networks discovered during the scanNetworks