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Patch from Ben Hutchings: explicitly initialise something which some
gccs complained about.

[originally from svn r8923]

--- a/tree234.c

+++ b/tree234.c

@@ -1160,7 +1160,7 @@

  * in t.

  */

 static node234 *split234_internal(tree234 *t, int index) {

-    node234 *halves[2], *n, *sib, *sub;

+    node234 *halves[2] = { NULL, NULL }, *n, *sib, *sub;

     node234 *lparent, *rparent;

     int ki, pki, i, half, lcount, rcount;