vfio/pci: Fix incorrect error message

When the "No host device provided" error occurs, the hint message
that starts with "Use -vfio-pci," makes no sense, since "-vfio-pci"
is not a valid command line parameter.

Correct this by replacing "-vfio-pci" with "-device vfio-pci".
Signed-off-by: NDong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
Reviewed-by: NEric Auger <eric.auger@redhat.com>
Signed-off-by: NAlex Williamson <alex.williamson@redhat.com>

hw/vfio/pci.c

@@ -2625,8 +2625,8 @@ static void vfio_realize(PCIDevice *pdev, Error **errp)
         if (!(~vdev->host.domain || ~vdev->host.bus ||
               ~vdev->host.slot || ~vdev->host.function)) {
             error_setg(errp, "No provided host device");
-            error_append_hint(errp, "Use -vfio-pci,host=DDDD:BB:DD.F "
-                              "or -vfio-pci,sysfsdev=PATH_TO_DEVICE\n");
+            error_append_hint(errp, "Use -device vfio-pci,host=DDDD:BB:DD.F "
+                              "or -device vfio-pci,sysfsdev=PATH_TO_DEVICE\n");
             return;
         }
         vdev->vbasedev.sysfsdev =