misc: pci_endpoint_test: Avoid triggering a BUG()

If you call ida_simple_remove(&pci_endpoint_test_ida, id) with a
negative "id" then it triggers an immediate BUG_ON().  Let's not allow
that.

Fixes: 2c156ac ("misc: Add host side PCI driver for PCI test function device")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/misc/pci_endpoint_test.c

@@ -597,6 +597,8 @@ static void pci_endpoint_test_remove(struct pci_dev *pdev)
 
 	if (sscanf(misc_device->name, DRV_MODULE_NAME ".%d", &id) != 1)
 		return;
+	if (id < 0)
+		return;
 
 	misc_deregister(&test->miscdev);
 	ida_simple_remove(&pci_endpoint_test_ida, id);