[PATCH] pci/vfio: fixup rte_intr_callback_unregister() handling

[Darek Stojaczyk <dariusz.stojaczyk@intel.com>]

This function is documented to return the number of unregistered
callbacks or negative numbers on error, but pci_vfio checks for
ret != 0 to detect failures. Not anymore.

Fixes: c115fd000c32 ("vfio: handle hotplug request notifier")
Cc: jia.guo@intel.com
Cc: stable@dpdk.org

Signed-off-by: Darek Stojaczyk <dariusz.stojaczyk@intel.com>
---
 drivers/bus/pci/linux/pci_vfio.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/bus/pci/linux/pci_vfio.c b/drivers/bus/pci/linux/pci_vfio.c
index b1f0683fe..305cc0601 100644
--- a/drivers/bus/pci/linux/pci_vfio.c
+++ b/drivers/bus/pci/linux/pci_vfio.c
@@ -341,7 +341,7 @@ pci_vfio_enable_notifier(struct rte_pci_device *dev, int vfio_dev_fd)
 		ret = rte_intr_callback_unregister(&dev->vfio_req_intr_handle,
 						 pci_vfio_req_handler,
 						 (void *)&dev->device);
-		if (ret)
+		if (ret < 0)
 			RTE_LOG(ERR, EAL,
 				"Fail to unregister req notifier handler.\n");
 		goto error;
@@ -373,7 +373,7 @@ pci_vfio_disable_notifier(struct rte_pci_device *dev)
 	ret = rte_intr_callback_unregister(&dev->vfio_req_intr_handle,
 					   pci_vfio_req_handler,
 					   (void *)&dev->device);
-	if (ret) {
+	if (ret < 0) {
 		RTE_LOG(ERR, EAL,
 			 "fail to unregister req notifier handler.\n");
 		return -1;
-- 
2.17.1