qemu: avoid NULL derefs
The processWatchdogEvent fix is real, although it can only trigger on OOM, since bad things happen if doCoreDump is called with a NULL pathname argument. The other fixes silence clang, but aren't a real bug because virReportErrorHelper tolerates a NULL format string even though *printf does not. * src/qemu/qemu_driver.c (processWatchdogEvent): Exit on OOM. (qemuDomainIsActive, qemuDomainIsPersistent, qemuDomainIsUpdated): Provide valid message.
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