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hat-test: fix array underrun.

Having _checked_ whether a hat index in my four-colouring maps was -1, I
then went ahead and used it as an array index anyway, oops!

--- a/auxiliary/hat-test.c

+++ b/auxiliary/hat-test.c

@@ -316,7 +316,9 @@

      */

     for (i = 0; i < 4; i++) {

         /* They should be the same metatile, so have same number of hats! */

-        assert((f1[i] == -1) == (f2[i] == -1));

+        if (f1[i] == -1 && f2[i] == -1)

+            continue;

+        assert(f1[i] != -1 && f2[i] != -1);

         if (f1[i] != 255)

             newm.map[f2[i]] = prevm.map[f1[i]];