udmabuf: constify udmabuf_create args

Reported-by: Laurent Pinchart <[e-mail]>
Signed-off-by: Gerd Hoffmann <[e-mail]>
Reviewed-by: Laurent Pinchart <[e-mail]>
Acked-by: Daniel Vetter <[e-mail]>
Link: http://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/dma-buf/udmabuf.c

···
 #define SEALS_WANTED (F_SEAL_SHRINK)
 #define SEALS_DENIED (F_SEAL_WRITE)
 
-static long udmabuf_create(struct udmabuf_create_list *head,
-			   struct udmabuf_create_item *list)
+static long udmabuf_create(const struct udmabuf_create_list *head,
+			   const struct udmabuf_create_item *list)
 {
 	DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
 	struct file *memfd = NULL;