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memory leak for pthread_create by valgrind
Description of problem:
qemu_thread_create calls pthread_create have memory leak
valgrind stack
```
==4075190== 1,776 bytes in 3 blocks are possibly lost in loss record 6,778 of 6,978
==4075190== at 0x4C3721A: calloc (vg_replace_malloc.c:760)
==4075190== by 0x40129EB: _dl_allocate_tls (in /usr/lib64/ld-2.28.so)
==4075190== by 0xADA3DA2: pthread_create@@GLIBC_2.2.5 (in /usr/lib64/libpthread-2.28.so)
==4075190== by 0x9B0DA5: qemu_thread_create (qemu-thread-posix.c:581)
==4075190== by 0x9C470C: do_spawn_thread (thread-pool.c:145)
==4075190== by 0x9C47C0: worker_thread (thread-pool.c:82)
==4075190== by 0x9AFD89: qemu_thread_start (qemu-thread-posix.c:541)
==4075190== by 0xADA3149: start_thread (in /usr/lib64/libpthread-2.28.so)
==4075190== by 0xB0B7DC2: clone (in /usr/lib64/libc-2.28.so)
==4075190==
==4075190== 2,368 bytes in 4 blocks are possibly lost in loss record 6,834 of 6,978
==4075190== at 0x4C3721A: calloc (vg_replace_malloc.c:760)
==4075190== by 0x40129EB: _dl_allocate_tls (in /usr/lib64/ld-2.28.so)
==4075190== by 0xADA3DA2: pthread_create@@GLIBC_2.2.5 (in /usr/lib64/libpthread-2.28.so)
==4075190== by 0x9B0DA5: qemu_thread_create (qemu-thread-posix.c:581)
==4075190== by 0x827FA8: kvm_start_vcpu_thread (kvm-accel-ops.c:75)
==4075190== by 0x633672: qemu_init_vcpu (cpus.c:642)
==4075190== by 0x722EA7: x86_cpu_realizefn (cpu.c:7430)
==4075190== by 0x833E2E: device_set_realized (qdev.c:510)
==4075190== by 0x8371D5: property_set_bool (object.c:2299)
==4075190== by 0x839512: object_property_set (object.c:1434)
==4075190== by 0x83C58E: object_property_set_qobject (qom-qobject.c:28)
==4075190== by 0x839783: object_property_set_bool (object.c:1503)
```
If we do vcpu hotplug and hot unplug for virtual machine continuously, the virtual memory and RES memory of qemu is increasing.
Steps to reproduce:
1. start qemu：
valgrind --tool=memcheck --leak-check=full /home/qemu-system-x86_64 -accel kvm -cpu host -m 4G -smp 4,maxcpus=64,sockets=8,dies=1,cores=8,threads=1 -drive file=/home/centosx861.qcow2,if=none,id=drive0,cache=none -device virtio-blk,drive=drive0,bootindex=1 -monitor stdio -vnc :0
2. after boot successful
ctl+c kill qemu
```
==4075190== 1,776 bytes in 3 blocks are possibly lost in loss record 6,778 of 6,978
==4075190== at 0x4C3721A: calloc (vg_replace_malloc.c:760)
==4075190== by 0x40129EB: _dl_allocate_tls (in /usr/lib64/ld-2.28.so)
==4075190== by 0xADA3DA2: pthread_create@@GLIBC_2.2.5 (in /usr/lib64/libpthread-2.28.so)
==4075190== by 0x9B0DA5: qemu_thread_create (qemu-thread-posix.c:581)
==4075190== by 0x9C470C: do_spawn_thread (thread-pool.c:145)
==4075190== by 0x9C47C0: worker_thread (thread-pool.c:82)
==4075190== by 0x9AFD89: qemu_thread_start (qemu-thread-posix.c:541)
==4075190== by 0xADA3149: start_thread (in /usr/lib64/libpthread-2.28.so)
==4075190== by 0xB0B7DC2: clone (in /usr/lib64/libc-2.28.so)
==4075190==
==4075190== 2,368 bytes in 4 blocks are possibly lost in loss record 6,834 of 6,978
==4075190== at 0x4C3721A: calloc (vg_replace_malloc.c:760)
==4075190== by 0x40129EB: _dl_allocate_tls (in /usr/lib64/ld-2.28.so)
==4075190== by 0xADA3DA2: pthread_create@@GLIBC_2.2.5 (in /usr/lib64/libpthread-2.28.so)
==4075190== by 0x9B0DA5: qemu_thread_create (qemu-thread-posix.c:581)
==4075190== by 0x827FA8: kvm_start_vcpu_thread (kvm-accel-ops.c:75)
==4075190== by 0x633672: qemu_init_vcpu (cpus.c:642)
==4075190== by 0x722EA7: x86_cpu_realizefn (cpu.c:7430)
==4075190== by 0x833E2E: device_set_realized (qdev.c:510)
==4075190== by 0x8371D5: property_set_bool (object.c:2299)
==4075190== by 0x839512: object_property_set (object.c:1434)
==4075190== by 0x83C58E: object_property_set_qobject (qom-qobject.c:28)
==4075190== by 0x839783: object_property_set_bool (object.c:1503)
```
Additional information:
|