Audit CF for cyclomatic complexity compliance

Checklist (Please check before submitting)

[x ] I reviewed the [Contributing Guide](https://github.com/nasa/FM/blob/main/CONTRIBUTING.md).
[x ] I reviewed the [README file](https://github.com/nasa/FM/blob/main/README.md) to see if the feature is in the major future work.
[x ] I performed a cursory search to see if the feature request is relevant, not redundant, nor in conflict with other tickets.

Is your feature request related to a problem? Please describe.
NASA guidelines in NPR 7150.2D recommends maintaining a cyclomatic complexity (cc) in software, in particular flight software of 15 or less.

cf_cmd.c:CF_CmdWriteQueue (cc of 18) and cf_cfdp_r.c:CF_CFDP_R_Tick (cc of 17) unnecessarily violate the recommendation of a cyclomatic complexity of 15 or less.

Describe the solution you'd like
Audit cf_cmd.c:CF_CmdWriteQueue and cf_cfdp_r.c:CF_CFDP_R_Tick to see if functions would benefit from simplification such that they comply with NPR 7150.2D recommendation.

Requester Info
Dan Knutsen

Start by inspecting cf_cmd.c:CF_CmdWriteQueue and cf_cfdp_r.c:CF_CFDP_R_Tick, focusing on the branches that produce cyclomatic complexity values of 18 and 17. Review the surrounding flight-software behavior before simplifying either function. Done means both functions comply with the NPR 7150.2D recommendation of cyclomatic complexity 15 or less.