OpenBSD / NetBSD use HW_NCPUONLINE to detect the online CPU
count. OpenBSD ships with SMT disabled on X86 systems so
HW_NCPU would provide double the number of CPUs as opposed
to the proper online count.

Signed-off-by: Brad Smith <redacted>
---
  thread-utils.c | 8 ++++----
  1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/thread-utils.c b/thread-utils.c
index 1f89ffab4c..374890e6b0 100644
--- a/thread-utils.c
+++ b/thread-utils.c

@@ -46,11 +46,11 @@ int online_cpus(void)
  	mib[0] = CTL_HW;
  #  ifdef HW_AVAILCPU
  	mib[1] = HW_AVAILCPU;
-	len = sizeof(cpucount);
-	if (!sysctl(mib, 2, &cpucount, &len, NULL, 0))
-		return cpucount;
-#  endif /* HW_AVAILCPU */
+#  elif defined(HW_NCPUONLINE)
+	mib[1] = HW_NCPUONLINE;
+#  else
  	mib[1] = HW_NCPU;
+#  endif /* HW_AVAILCPU */
  	len = sizeof(cpucount);
  	if (!sysctl(mib, 2, &cpucount, &len, NULL, 0))
  		return cpucount;