tools/test: add missing virtual destructor

Signed-off-by: Patrick Venture <venture@google.com>
Change-Id: I4eb80d77e3bea4a5b3d6e88c5eac1a19db027135
diff --git a/tools/test/tools_pci_unittest.cpp b/tools/test/tools_pci_unittest.cpp
index 4c4f76a..4a45468 100644
--- a/tools/test/tools_pci_unittest.cpp
+++ b/tools/test/tools_pci_unittest.cpp
@@ -66,6 +66,7 @@
 class Device
 {
   public:
+    virtual ~Device() = default;
     virtual const struct pci_id_match* getMatch() const = 0;
     virtual struct pci_device getDevice() const = 0;
     virtual void expectSetup(PciAccessMock& pciMock,