xen/xenbus: Fixed indentation error in switch case

Fixed the indentation error in the switch case in
xenbus_dev_backend.c
Signed-off-by: Lisa Nguyen <lisa@xenapiadmin.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

drivers/xen/xenbus/xenbus_dev_backend.c

@@ -76,16 +76,14 @@ static long xenbus_backend_ioctl(struct file *file, unsigned int cmd, unsigned l
 		return -EPERM;
 
 	switch (cmd) {
-		case IOCTL_XENBUS_BACKEND_EVTCHN:
-			if (xen_store_evtchn > 0)
-				return xen_store_evtchn;
-			return -ENODEV;
-
-		case IOCTL_XENBUS_BACKEND_SETUP:
-			return xenbus_alloc(data);
-
-		default:
-			return -ENOTTY;
+	case IOCTL_XENBUS_BACKEND_EVTCHN:
+		if (xen_store_evtchn > 0)
+			return xen_store_evtchn;
+		return -ENODEV;
+	case IOCTL_XENBUS_BACKEND_SETUP:
+		return xenbus_alloc(data);
+	default:
+		return -ENOTTY;
 	}
 }