Checklist (Please check before submitting)

• I reviewed the Contributing Guide.
• I signed and emailed the appropriate Contributor License Agreement to [email protected] and copied [email protected].

Describe the contribution

Fixes #2581

• Checks the return value of the read operation done in cfe_fs_api.c to make sure the correct number of bytes was read.
• Handles cases where the read operation fails or reads fewer bytes than expected, preventing the use of uninitialized or partially initialized data.

Testing performed

Added a unit test to simulate scenario where the file read operation reads fewer bytes than expected.

Expected behavior changes

When a read operation fails, the system now exits the function early, preventing potential undefined behavior.

System(s) tested on

OS: Ubuntu 18.04

Contributor Info - All information REQUIRED for consideration of pull request

Tvisha Andharia - GSFC 582 intern