Remove unused debugging arg from last change

[Jeff Law]

Committed as obvious.

       * tree-ssa-threadedge.c (cond_arg_set_in_bb): Remove unused
        debugging argument.


Index: tree-ssa-threadedge.c
===================================================================
--- tree-ssa-threadedge.c       (revision 192745)
+++ tree-ssa-threadedge.c       (working copy)
@@ -580,7 +580,7 @@
    in e->dest.  */
 
 static bool
-cond_arg_set_in_bb (edge e, basic_block bb, int n)
+cond_arg_set_in_bb (edge e, basic_block bb)
 {
   ssa_op_iter iter;
   use_operand_p use_p;