qemu_capabilities: Use proper free function for caps->cpuModels

The cpuModels member of _virQEMUCapsAccel struct is not a
virObject but regular struct with a free function defined:
qemuMonitorCPUDefsFree(). Use that when clearing parent structure
instead of virObjectUnref() to avoid a memleak:

==212322== 57,275 (48 direct, 57,227 indirect) bytes in 3 blocks are definitely lost in loss record 623 of 627
==212322==    at 0x4838B86: calloc (vg_replace_malloc.c:762)
==212322==    by 0x554A158: g_malloc0 (in /usr/lib64/libglib-2.0.so.0.6000.6)
==212322==    by 0x17B14BF5: qemuMonitorCPUDefsNew (qemu_monitor.c:3587)
==212322==    by 0x17B27BA7: qemuMonitorJSONGetCPUDefinitions (qemu_monitor_json.c:5616)
==212322==    by 0x17B14B0B: qemuMonitorGetCPUDefinitions (qemu_monitor.c:3559)
==212322==    by 0x17A6AFBB: virQEMUCapsFetchCPUDefinitions (qemu_capabilities.c:2571)
==212322==    by 0x17A6B2CC: virQEMUCapsProbeQMPCPUDefinitions (qemu_capabilities.c:2629)
==212322==    by 0x17A70C00: virQEMUCapsInitQMPMonitorTCG (qemu_capabilities.c:4769)
==212322==    by 0x17A70DDF: virQEMUCapsInitQMPSingle (qemu_capabilities.c:4820)
==212322==    by 0x17A70E99: virQEMUCapsInitQMP (qemu_capabilities.c:4848)
==212322==    by 0x17A71044: virQEMUCapsNewForBinaryInternal (qemu_capabilities.c:4891)
==212322==    by 0x17A7119C: virQEMUCapsNewData (qemu_capabilities.c:4923)
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>
Reviewed-by: NJiri Denemark <jdenemar@redhat.com>

src/qemu/qemu_capabilities.c

@@ -1798,7 +1798,7 @@ virQEMUCapsAccelClear(virQEMUCapsAccelPtr caps)
     VIR_FREE(caps->machineTypes);
 
     virQEMUCapsHostCPUDataClear(&caps->hostCPU);
-    virObjectUnref(caps->cpuModels);
+    qemuMonitorCPUDefsFree(caps->cpuModels);
 }