Fix #129, Address Sanitizer

[avan989]

Fix #129, Fix Address Sanitizer in hs_monitors_tests.c

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• I reviewed the Contributing Guide.
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Describe the contribution
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• Include explicitly what issue it addresses [e.g. Fixes #X]
  Fix Address Sanitizer issue for hs_monitors_tests.c #129, resolve address sanitizer

Testing performed
Steps taken to test the contribution:
-fsanitize=address
-fsanitize=undefined
-fsanitize-recover=all
-g
)
add_link_options(
-fsanitize=address
-fsanitize=undefined
-fsanitize-recover=all
)

Make SIMULATION=native ENABLE_UNIT_TESTS=true prep

make install

Run Test

Expected behavior changes
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None

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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• Note CLA's apply to software contributions.
  Anh Van, GSFC