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由 Laine Stump 提交于
virDomainGraphicsListenSetAddress() and virDomainGraphicsListenSetNetwork() both set their respective char* to NULL directly when asked to set it to NULL, which is okay as long as it's already set to NULL. If these functions are ever called to clear a listen object that has a valid string in address or network, it will end up leaking the old value. Currently that doesn't happen, so this is just a preemptive strike.
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