[fuse] Fix accounting the number of waiting requests

Properly accounting the number of waiting requests was forgotten in
"clean up request accounting" patch.

Signed-off-by: Miklos Szeredi <miklos@szeredi.hu>
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index ee9b830..59661c4 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -159,6 +159,9 @@
 	/** Data is being copied to/from the request */
 	unsigned locked:1;
 
+	/** Request is counted as "waiting" */
+	unsigned waiting:1;
+
 	/** State of the request */
 	enum fuse_req_state state;