dmabuf: annotate dma_buf->active

Contains POLL... bitmaps

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/include/linux/dma-buf.h b/include/linux/dma-buf.h
index 79f27d6..085db2f 100644
--- a/include/linux/dma-buf.h
+++ b/include/linux/dma-buf.h
@@ -301,7 +301,7 @@
 		struct dma_fence_cb cb;
 		wait_queue_head_t *poll;
 
-		unsigned long active;
+		__poll_t active;
 	} cb_excl, cb_shared;
 };