net_sched: remove exceptional & on function name

In this file, function names are otherwise used as pointers without &.

A simplified version of the Coccinelle semantic patch that makes this
change is as follows:

// <smpl>
@r@
identifier f;
@@

f(...) { ... }

@@
identifier r.f;
@@

- &f
+ f
// </smpl>

Signed-off-by: Himangi Saraogi <himangi774@gmail.com>
Acked-by: Julia Lawall <julia.lawall@lip6.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/sched/cls_tcindex.c

@@ -420,7 +420,7 @@ static void tcindex_destroy(struct tcf_proto *tp)
 	pr_debug("tcindex_destroy(tp %p),p %p\n", tp, p);
 	walker.count = 0;
 	walker.skip = 0;
-	walker.fn = &tcindex_destroy_element;
+	walker.fn = tcindex_destroy_element;
 	tcindex_walk(tp, &walker);
 	kfree(p->perfect);
 	kfree(p->h);