resource-control: fix setting CPU affinities on Linux

With this fix the vCPU pinning feature chooses the correct
physical cores to pin the vCPU threads on rather than always using core 0.

Fixes #6831

Signed-off-by: Peteris Rudzusiks <rye@stripe.com>

src/runtime/pkg/resourcecontrol/utils_linux.go

@@ -156,7 +156,7 @@ func IsCgroupV1() (bool, error) {
 func SetThreadAffinity(threadID int, cpuSetSlice []int) error {
 	unixCPUSet := unix.CPUSet{}
 
-	for cpuId := range cpuSetSlice {
+	for _, cpuId := range cpuSetSlice {
 		unixCPUSet.Set(cpuId)
 	}