getstats: avoid memory leak on OOM
qemuDomainGetStatsBlock() could leak a stats hash table if it
encountered OOM while populating the virTypedParameters.
Oddly, the fix doesn't even touch qemuDomainGetStatsBlock :)
* src/qemu/qemu_driver.c (QEMU_ADD_COUNT_PARAM)
(QEMU_ADD_NAME_PARAM): Don't return early.
(qemuDomainGetStatsInterface): Adjust caller.
Signed-off-by: NEric Blake <eblake@redhat.com>
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