NTP Client tutorial code simplification

Compiling the tutorial code for Uno:

Sketch uses 11436 bytes (35%) of program storage space. Maximum is 32256 bytes.
Global variables use 650 bytes (31%) of dynamic memory, leaving 1398 bytes for local variables. Maximum is 2048 bytes.

Compiling your code for Uno:

Sketch uses 12870 bytes (39%) of program storage space. Maximum is 32256 bytes.
Global variables use 666 bytes (32%) of dynamic memory, leaving 1382 bytes for local variables. Maximum is 2048 bytes.