Eliminate dead assignment in regex_internal.c/re_node_set_insert()

[Tim Rühsen]

Please consider applying this

diff --git a/lib/regex_internal.c b/lib/regex_internal.c
index 9004ce809..15f38a755 100644
--- a/lib/regex_internal.c
+++ b/lib/regex_internal.c
@@ -1311,7 +1311,6 @@ re_node_set_insert (re_node_set *set, Idx elem)
      first element separately to skip a check in the inner loop.  */
   if (elem < set->elems[0])
     {
-      idx = 0;
       for (idx = set->nelem; idx > 0; idx--)
        set->elems[idx] = set->elems[idx - 1];
     }

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