qemu: avoid qemu_driver being unlocked twice when virThreadPoolNew() failed
qemu: avoid qemu_driver being unlocked twice when virThreadPoolNew() failed

We do not lock qemu_driver when calling virThreadPoolNew(). If it failed,
we will unlock qemu_driver. It is dangerous.

We may use this pool during auto starting domains. So we must create it before
calling qemuAutostartDomains(). Otherwise, libvirtd will crash.

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