virSecurityDACChownListFree: Don't leak list->items array
    
    We're freeing individual items in it but not the array itself.
    
    ==19200== 40 bytes in 1 blocks are definitely lost in loss record 847 of 1,059
    ==19200==    at 0x4C2D12F: realloc (vg_replace_malloc.c:785)
    ==19200==    by 0x52C5532: virReallocN (viralloc.c:245)
    ==19200==    by 0x52C5628: virExpandN (viralloc.c:294)
    ==19200==    by 0x52C58FC: virInsertElementsN (viralloc.c:436)
    ==19200==    by 0x542856B: virSecurityDACChownListAppend (security_dac.c:115)
    ==19200==    by 0x54286B4: virSecurityDACTransactionAppend (security_dac.c:167)
    ==19200==    by 0x542902F: virSecurityDACSetOwnershipInternal (security_dac.c:560)
    ==19200==    by 0x54295D6: virSecurityDACSetOwnership (security_dac.c:650)
    ==19200==    by 0x542AEE0: virSecurityDACSetInputLabel (security_dac.c:1472)
    ==19200==    by 0x542B61D: virSecurityDACSetAllLabel (security_dac.c:1693)
    ==19200==    by 0x542DD67: virSecurityManagerSetAllLabel (security_manager.c:869)
    ==19200==    by 0x54279C2: virSecurityStackSetAllLabel (security_stack.c:361)
    
    Signed-off-by: Michal Privoznik <mprivozn@redhat.com>