update-game-score: fix bug with -r

* update-game-score.c (main): Don't set 'scores' to garbage when
-r is specified and scorecount != MAX_SCORES.  This bug was
introduced in the 2002-04-10 change, and was found with gcc
-Wstrict-overflow (GCC 4.5.2, x86-64).

lib-src/ChangeLog

 2011-03-21  Paul Eggert  <eggert@cs.ucla.edu>
 
+	update-game-score: fix bug with -r
+	* update-game-score.c (main): Don't set 'scores' to garbage when
+	-r is specified and scorecount != MAX_SCORES.  This bug was
+	introduced in the 2002-04-10 change, and was found with gcc
+	-Wstrict-overflow (GCC 4.5.2, x86-64).
+
 	fakemail: Remove dependency on ignore-value.
 	This undoes some of the recent fakemail-related changes.
 	It is made possible due to recent changes to gnulib's stdio module.

lib-src/update-game-score.c

@@ -242,13 +242,15 @@ main (int argc, char **argv)
   push_score (&scores, &scorecount, newscore, user_id, newdata);
   sort_scores (scores, scorecount, reverse);
   /* Limit the number of scores.  If we're using reverse sorting, then
-     we should increment the beginning of the array, to skip over the
-     *smallest* scores.  Otherwise, we just decrement the number of
-     scores, since the smallest will be at the end. */
+     also increment the beginning of the array, to skip over the
+     *smallest* scores.  Otherwise, just decrementing the number of
+     scores suffices, since the smallest is at the end. */
   if (scorecount > MAX_SCORES)
-    scorecount -= (scorecount - MAX_SCORES);
-  if (reverse)
-    scores += (scorecount - MAX_SCORES);
+    {
+      if (reverse)
+	scores += (scorecount - MAX_SCORES);
+      scorecount = MAX_SCORES;
+    }
   if (write_scores (scorefile, scores, scorecount) < 0)
     {
       unlock_file (scorefile, lockstate);