Since vfio_intx_enable_kvm() takes an 'Error **' argument,
best practices suggest to return a bool. See the qapi/error.h
Rules section.

Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
---
 hw/vfio/pci.c | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
index aad012c348..12fb534d79 100644
--- a/hw/vfio/pci.c
+++ b/hw/vfio/pci.c
@@ -116,7 +116,7 @@ static void vfio_intx_eoi(VFIODevice *vbasedev)
     vfio_unmask_single_irqindex(vbasedev, VFIO_PCI_INTX_IRQ_INDEX);
 }
 
-static void vfio_intx_enable_kvm(VFIOPCIDevice *vdev, Error **errp)
+static bool vfio_intx_enable_kvm(VFIOPCIDevice *vdev, Error **errp)
 {
 #ifdef CONFIG_KVM
     int irq_fd = event_notifier_get_fd(&vdev->intx.interrupt);
@@ -124,7 +124,7 @@ static void vfio_intx_enable_kvm(VFIOPCIDevice *vdev, Error **errp)
     if (vdev->no_kvm_intx || !kvm_irqfds_enabled() ||
         vdev->intx.route.mode != PCI_INTX_ENABLED ||
         !kvm_resamplefds_enabled()) {
-        return;
+        return true;
     }
 
     /* Get to a known interrupt state */
@@ -161,7 +161,7 @@ static void vfio_intx_enable_kvm(VFIOPCIDevice *vdev, Error **errp)
 
     trace_vfio_intx_enable_kvm(vdev->vbasedev.name);
 
-    return;
+    return true;
 
 fail_vfio:
     kvm_irqchip_remove_irqfd_notifier_gsi(kvm_state, &vdev->intx.interrupt,
@@ -171,6 +171,9 @@ fail_irqfd:
 fail:
     qemu_set_fd_handler(irq_fd, vfio_intx_interrupt, NULL, vdev);
     vfio_unmask_single_irqindex(&vdev->vbasedev, VFIO_PCI_INTX_IRQ_INDEX);
+    return false;
+#else
+    return true;
 #endif
 }
 
@@ -226,8 +229,7 @@ static void vfio_intx_update(VFIOPCIDevice *vdev, PCIINTxRoute *route)
         return;
     }
 
-    vfio_intx_enable_kvm(vdev, &err);
-    if (err) {
+    if (!vfio_intx_enable_kvm(vdev, &err)) {
         warn_reportf_err(err, VFIO_MSG_PREFIX, vdev->vbasedev.name);
     }
 
@@ -302,8 +304,7 @@ static int vfio_intx_enable(VFIOPCIDevice *vdev, Error **errp)
         return -errno;
     }
 
-    vfio_intx_enable_kvm(vdev, &err);
-    if (err) {
+    if (!vfio_intx_enable_kvm(vdev, &err)) {
         warn_reportf_err(err, VFIO_MSG_PREFIX, vdev->vbasedev.name);
     }
 
-- 
2.34.1