home: fix heap-use-after-free
`bus_home_emit_remove()` may be called from manager_free() -> home_free(). In that case, manager->bus is already unref()ed. Fixes #21767.
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`bus_home_emit_remove()` may be called from manager_free() -> home_free(). In that case, manager->bus is already unref()ed. Fixes #21767.