cpuset: fix cppcheck missingReturn errors

[Copilot]

Functions in src/cpuset.c using #if/#elif preprocessor chains without a final #else clause trigger cppcheck missingReturn errors, since no return statement exists when none of the defined macros match.

Changes

• Added #else return 0; fallback to the six affected functions:
  • ha_cpuset_set, ha_cpuset_clr — already had an early return 1 guard, missing #else in the macro chain
  • ha_cpuset_count, ha_cpuset_ffs, ha_cpuset_isequal, ha_cpuset_size — no fallback path at all

Before:

int ha_cpuset_size()
{
#if defined(CPUSET_USE_CPUSET) || defined(CPUSET_USE_FREEBSD_CPUSET)
    return CPU_SETSIZE;
#elif defined(CPUSET_USE_ULONG)
    return LONGBITS;
#endif  // ← no return if neither macro is defined
}

After:

int ha_cpuset_size()
{
#if defined(CPUSET_USE_CPUSET) || defined(CPUSET_USE_FREEBSD_CPUSET)
    return CPU_SETSIZE;
#elif defined(CPUSET_USE_ULONG)
    return LONGBITS;
#else
    return 0;
#endif
}

Original prompt

---

This section details on the original issue you should resolve

<issue_title>fix cppcheck finding</issue_title>
<issue_description>we need to address the following cppcheck finding

src/cpuset.c:21:11: error: Found an exit path from function with non-void return type that has missing return statement [missingReturn]
src/cpuset.c:36:11: error: Found an exit path from function with non-void return type that has missing return statement [missingReturn]
src/cpuset.c:100:1: error: Found an exit path from function with non-void return type that has missing return statement [missingReturn]
src/cpuset.c:124:1: error: Found an exit path from function with non-void return type that has missing return statement [missingReturn]
src/cpuset.c:152:1: error: Found an exit path from function with non-void return type that has missing return statement [missingReturn]
src/cpuset.c:163:1: error: Found an exit path from function with non-void return type that has missing return statement [missingReturn]
```</issue_description>

## Comments on the Issue (you are @copilot in this section)

<comments>
</comments>

• Fixes fix cppcheck finding #25

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