Unused values and uninitialized variable static analysis warnings

[skliper]

Checklist (Please check before submitting)

• I reviewed the Contributing Guide.
• I reviewed the README file to see if the feature is in the major future work.
• 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.
Unused values set in ds_table.c, uninitialized variable warning in ds_file_tests.c

Describe the solution you'd like
Squash

Describe alternatives you've considered
None

Additional context
Static analysis license restricts sharing actual warnings

Requester Info
Jacob Hageman - NASA/GSFC