numa_preferred API has memory leak

[luochenglcs]

#include <numa.h>
  
void main(void)
{
   while (1) {
        numa_preferred();
   }
}

numa_preferred API has memory leak.

build:

gcc -g test_preferred.c -lnuma -o test_preferred

run:

[root@localhost home]# ./test_preferred

[root@localhost numactl]# free -h
              total        used        free      shared  buff/cache   available
Mem:           15Gi       4.6Gi        10Gi        19Mi       906Mi        10Gi
Swap:            0B          0B          0B
[root@localhost numactl]# free -h
              total        used        free      shared  buff/cache   available
Mem:           15Gi       4.7Gi        10Gi        19Mi       906Mi        10Gi
Swap:            0B          0B          0B
[root@localhost numactl]# free -h
              total        used        free      shared  buff/cache   available
Mem:           15Gi       4.8Gi         9Gi        19Mi       906Mi        10Gi
Swap:            0B          0B          0B
[root@localhost numactl]# free -h
              total        used        free      shared  buff/cache   available
Mem:           15Gi       4.8Gi       9.9Gi        19Mi       906Mi        10Gi
Swap:            0B          0B          0B
[root@localhost numactl]# free -h
              total        used        free      shared  buff/cache   available
Mem:           15Gi       4.9Gi       9.8Gi        19Mi       906Mi        10Gi
Swap:            0B          0B          0B
[root@localhost numactl]# free -h
              total        used        free      shared  buff/cache   available
Mem:           15Gi       5.0Gi       9.8Gi        19Mi       906Mi        10Gi
Swap:            0B          0B          0B

[luochenglcs]

we fix it by freeing bmp.

[root@localhost home]# ./test_preferred

[root@localhost numactl]# free -h
              total        used        free      shared  buff/cache   available
Mem:           15Gi       4.3Gi        11Gi        19Mi       121Mi        11Gi
Swap:            0B          0B          0B
[root@localhost numactl]# free -h
              total        used        free      shared  buff/cache   available
Mem:           15Gi       4.3Gi        11Gi        19Mi       121Mi        11Gi
Swap:            0B          0B          0B
[root@localhost numactl]# free -h
              total        used        free      shared  buff/cache   available
Mem:           15Gi       4.3Gi        11Gi        19Mi       121Mi        11Gi
Swap:            0B          0B          0B
[root@localhost numactl]# free -h
              total        used        free      shared  buff/cache   available
Mem:           15Gi       4.3Gi        11Gi        19Mi       121Mi        11Gi
Swap:            0B          0B          0B