pci: fix memory leak when detaching device

Fixes: dbe6b4b61b ("pci: probe or close device")

Signed-off-by: Yangchao Zhou <zhouyates@gmail.com>
Acked-by: David Marchand <david.marchand@6wind.com>

lib/librte_eal/common/eal_common_pci.c

@@ -387,6 +387,7 @@ rte_eal_pci_detach(const struct rte_pci_addr *addr)
 			goto err_return;
 
 		TAILQ_REMOVE(&pci_device_list, dev, next);
+		free(dev);
 		return 0;
 	}
 	return -1;