[master] 956d529fb vtree: Constify generated NFIND arguments

[Dridi Boukelmoune]

commit 956d529fb8236596e3bd2c01e78e4dac9ec13b27
Author: Dridi Boukelmoune <dridi.boukelmoune at gmail.com>
Date:   Thu Apr 17 12:58:29 2025 +0200

    vtree: Constify generated NFIND arguments
    
    I expected the tools/import_vtree_from_freebsd.sh script to take care of
    it when it was last updated.

diff --git a/include/vtree.h b/include/vtree.h
index d36233137..2d9cdf9cd 100644
--- a/include/vtree.h
+++ b/include/vtree.h
@@ -450,7 +450,7 @@ struct {								\
 #define VRBT_PROTOTYPE_FIND(name, type, attr)				\
 	attr struct type *name##_VRBT_FIND(const struct name *, const struct type *)
 #define VRBT_PROTOTYPE_NFIND(name, type, attr)				\
-	attr struct type *name##_VRBT_NFIND(struct name *, struct type *)
+	attr struct type *name##_VRBT_NFIND(const struct name *, const struct type *)
 #define VRBT_PROTOTYPE_NEXT(name, type, attr)				\
 	attr struct type *name##_VRBT_NEXT(struct type *)
 #define VRBT_PROTOTYPE_INSERT_NEXT(name, type, attr)			\