hash: make virHashFree more free-like
Two-argument free functions are uncommon; match the style elsewhere by caching the callback at creation. * src/util/hash.h (virHashCreate, virHashFree): Move deallocator argument to creation. * cfg.mk (useless_free_options): Add virHashFree. * src/util/hash.c (_virHashTable): Track deallocator. (virHashCreate, virHashFree): Update to new signature. * src/conf/domain_conf.c (virDomainObjListDeinit) (virDomainObjListInit, virDomainDiskDefForeachPath) (virDomainSnapshotObjListDeinit, virDomainSnapshotObjListInit): Update callers. * src/conf/nwfilter_params.c (virNWFilterHashTableFree) (virNWFilterHashTableCreate): Likewise. * src/conf/nwfilter_conf.c (virNWFilterTriggerVMFilterRebuild): Likewise. * src/cpu/cpu_generic.c (genericHashFeatures, genericBaseline): Likewise. * src/xen/xm_internal.c (xenXMOpen, xenXMClose): Likewise. * src/nwfilter/nwfilter_learnipaddr.c (virNWFilterLearnInit) (virNWFilterLearnShutdown): Likewise. * src/qemu/qemu_command.c (qemuDomainPCIAddressSetCreate) (qemuDomainPCIAddressSetFree): Likewise. * src/qemu/qemu_process.c (qemuProcessWaitForMonitor): Likewise.
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