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Optimiser placation for OS X gcc.

[originally from svn r6212]

--- a/loopy.c

+++ b/loopy.c

@@ -2226,6 +2226,7 @@

     /*

      * Check for completion.

      */

+    i = 0;			       /* placate optimiser */

     for (j = 0; j <= newstate->h; j++) {

 	for (i = 0; i < newstate->w; i++)

 	    if (LV_RIGHTOF_DOT(newstate, i, j) == LINE_YES)