Fix #180, Remove 'return;' from last line of void functions.

Checklist

[x] I reviewed the Contributing Guide.
[x] I signed and emailed the appropriate Contributor License Agreement to GSFC-SoftwareRelease@mail.nasa.gov and copied cfs-program@lists.nasa.gov.

Describe the contribution Fixes #180 Removes all cases of redundant "return;" statements on the last line of void functions.

Testing performed None, prior to submission.

Expected behavior changes No impact on behavior.

Contributor Info @thnkslprpt

nasa / sample_app