Fix #363, decoding segs using incorrect macro

[dmknutsen]

Checklist (Please check before submitting)

• [x ] I reviewed the Contributing Guide.
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Describe the contribution
Fix #363

Will now use the correct macro - CF_PDU_MAX_SEGMENTS as opposed to CF_PDU_MAX_TLV

Testing performed
Steps taken to test the contribution:

1. Unit/coverage testing
2. Build verification testing

System(s) tested on

• Ubuntu 20.04

Contributor Info - All information REQUIRED for consideration of pull request
Dan Knutsen
NASA Goddard