misc: pci_endpoint_test: fix return value of error branch

We return 'err' in the error branch, but this variable may be set as
zero before. Fix it by setting 'err' as a negative value before we
goto the error label.

Fixes: e03327122e2c ("pci_endpoint_test: Add 2 ioctl commands")
Reported-by: Hulk Robot <[e-mail]>
Signed-off-by: Xiongfeng Wang <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/misc/pci_endpoint_test.c

···
 
 	pci_set_master(pdev);
 
-	if (!pci_endpoint_test_alloc_irq_vectors(test, irq_type))
+	if (!pci_endpoint_test_alloc_irq_vectors(test, irq_type)) {
+		err = -EINVAL;
 		goto err_disable_irq;
+	}
 
 	for (bar = 0; bar < PCI_STD_NUM_BARS; bar++) {
 		if (pci_resource_flags(pdev, bar) & IORESOURCE_MEM) {
···
 		goto err_ida_remove;
 	}
 
-	if (!pci_endpoint_test_request_irq(test))
+	if (!pci_endpoint_test_request_irq(test)) {
+		err = -EINVAL;
 		goto err_kfree_test_name;
+	}
 
 	misc_device = &test->miscdev;
 	misc_device->minor = MISC_DYNAMIC_MINOR;