vfio/ccw: Use the 'Error **errp' argument of vfio_ccw_realize()

The local error variable is kept for vfio_ccw_register_irq_notifier()
because it is not considered as a failing condition. We will change
how error reporting is done in following changes.

Remove the error_propagate() call.

Cc: Zhenzhong Duan <zhenzhong.duan@intel.com>
Signed-off-by: Cédric Le Goater <clg@redhat.com>
Reviewed-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Reviewed-by: Anthony Krowiak <akrowiak@linux.ibm.com>
Reviewed-by: Eric Farman <farman@linux.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-ID: <20240522170107.289532-6-clg@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

hw/vfio/ccw.c

@@ -582,8 +582,8 @@ static void vfio_ccw_realize(DeviceState *dev, Error **errp)
 
     /* Call the class init function for subchannel. */
     if (cdc->realize) {
-        if (!cdc->realize(cdev, vcdev->vdev.sysfsdev, &err)) {
-            goto out_err_propagate;
+        if (!cdc->realize(cdev, vcdev->vdev.sysfsdev, errp)) {
+            return;
         }
     }
 
@@ -596,17 +596,17 @@ static void vfio_ccw_realize(DeviceState *dev, Error **errp)
         goto out_attach_dev_err;
     }
 
-    if (!vfio_ccw_get_region(vcdev, &err)) {
+    if (!vfio_ccw_get_region(vcdev, errp)) {
         goto out_region_err;
     }
 
-    if (!vfio_ccw_register_irq_notifier(vcdev, VFIO_CCW_IO_IRQ_INDEX, &err)) {
+    if (!vfio_ccw_register_irq_notifier(vcdev, VFIO_CCW_IO_IRQ_INDEX, errp)) {
         goto out_io_notifier_err;
     }
 
     if (vcdev->crw_region) {
         if (!vfio_ccw_register_irq_notifier(vcdev, VFIO_CCW_CRW_IRQ_INDEX,
-                                            &err)) {
+                                            errp)) {
             goto out_irq_notifier_err;
         }
     }
@@ -634,8 +634,6 @@ out_attach_dev_err:
     if (cdc->unrealize) {
         cdc->unrealize(cdev);
     }
-out_err_propagate:
-    error_propagate(errp, err);
 }
 
 static void vfio_ccw_unrealize(DeviceState *dev)