Fix: remove unused instantiation of NBClient. (#113)

Author: aentinger

examples/GPRSUdpNtpClient/GPRSUdpNtpClient.ino

@@ -35,7 +35,6 @@ const int NTP_PACKET_SIZE = 48; // NTP time stamp is in the first 48 bytes of th
 byte packetBuffer[ NTP_PACKET_SIZE]; //buffer to hold incoming and outgoing packets
 
 // initialize the library instance
-NBClient client;
 GPRS gprs;
 NB nbAccess;