SoE response for a 512 entry list in IDN S-0-0017 gets additional 0 bytes appended

SoE response for a 512 entry list in IDN S-0-0017 gets additional 0 bytes appended in last fragment. This a result of fragmentation implementation errors.

Example from testing:

Unexpected mbx msg length: got 92 exp 72

17 82 75 81 76 81 77 81 78 81 79 81 7A 81 7B 81 

7C 81 7D 81 7E 81 7F 81 92 81 93 81 94 81 97 80 

96 81 97 81 98 81 99 81 9A 81 9B 81 9C 81 9D 81 

9E 81 9F 81 A0 81 A1 81 A2 81 A3 81 A4 81 A5 81 

A6 81 A7 81 00 00 00 00 00 00 00 00 00 00 00 00 

00 00 00 00 85 82 85 83