lxc: avoid null deref on lxcSetupLoopDevices failure
If the function lxcSetupLoopDevices(def, &nloopDevs, &loopDevs) failed,
the variable loopDevs will keep a initial NULL value, however, the
function VIR_FORCE_CLOSE(loopDevs[i]) will directly deref it.
This patch also fixes returning a bogous number of devices from
lxcSetupLoopDevices on an error path.
* rc/lxc/lxc_controller.c: fixed a null pointer dereference.
Signed-off-by: NAlex Jia <ajia@redhat.com>
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