virtio_balloon: coding style fixes

Most of our code has
struct foo {
}

Fix two instances where balloon is inconsistent.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
diff --git a/include/uapi/linux/virtio_balloon.h b/include/uapi/linux/virtio_balloon.h
index be40f70..4b0488f 100644
--- a/include/uapi/linux/virtio_balloon.h
+++ b/include/uapi/linux/virtio_balloon.h
@@ -36,8 +36,7 @@
 /* Size of a PFN in the balloon interface. */
 #define VIRTIO_BALLOON_PFN_SHIFT 12
 
-struct virtio_balloon_config
-{
+struct virtio_balloon_config {
 	/* Number of pages host wants Guest to give up. */
 	__le32 num_pages;
 	/* Number of pages we've actually got in balloon. */