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Pearl: fix bounds check in previous commit.

Ahem. That's what I get for testing the fix on a square puzzle.

--- a/pearl.c

+++ b/pearl.c

@@ -873,7 +873,7 @@

                 for (d = 1; d <= 8; d += d) {

                     int nx = x + DX(d), ny = y + DY(d);

                     int rlink;

-                    if (0 <= nx && nx < w && 0 <= ny && ny < w)

+                    if (0 <= nx && nx < w && 0 <= ny && ny < h)

                         rlink = result[ny*w+nx] & F(d);

                     else

                         rlink = 0;     /* off-board squares don't link back */