Fix #452, rtems sysmom overflow buffer

[avan989]

Fix #452, rtems sysmom coverage test causes an buffer overflow.

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Testing performed
Steps taken to test the contribution:

1. Run against RTEMS

2. Run unit test on linux

3. Make ENABLE_UNIT_TESTS=true SIMULATION=native

4. make install

5. make test

6. make lcov

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System(s) tested on

• Hardware: [e.g. PC, SP0, MCP750]
• OS: [e.g. Ubuntu 18.04, RTEMS 4.11, VxWorks 6.9]
• Versions: [e.g. cFE 6.6, OSAL 4.2, PSP 1.3 for mcp750, any related apps or tools]

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  Anh Van, GSFC

[dzbaker]

CCB 3 April 2025: Provisionally approved pending rename of num_cpus variable.

[avan989]

updated.