virtio: console: Fix return type for get_inbuf()

get_inbuf() returns void *.  There's no reason to return void pointers
instead of the correct struct port_buffer *.

Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c
index 8f49d0f..3516aeb 100644
--- a/drivers/char/virtio_console.c
+++ b/drivers/char/virtio_console.c
@@ -348,7 +348,7 @@
 }
 
 /* Callers should take appropriate locks */
-static void *get_inbuf(struct port *port)
+static struct port_buffer *get_inbuf(struct port *port)
 {
 	struct port_buffer *buf;
 	struct virtqueue *vq;