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Add pointless initialisations to placate a gcc warning.

(I'm confident these can't happen. maxb is initialised whenever we
break from the first loop with y < h, and when we don't break from
that loop the second loop which uses maxb is run zero times. But gcc
can't work that out, sigh.)

[originally from svn r9546]

--- a/bridges.c

+++ b/bridges.c

@@ -940,6 +940,7 @@

         idx = x;

         s = e = -1;

         bl = 0;

+        maxb = state->params.maxb;     /* placate optimiser */

         /* Unset possible flags until we find an island. */

         for (y = 0; y < state->h; y++) {

             is_s = IDX(state, gridi, idx);

@@ -985,6 +986,7 @@

         idx = y*w;

         s = e = -1;

         bl = 0;

+        maxb = state->params.maxb;     /* placate optimiser */

         for (x = 0; x < state->w; x++) {

             is_s = IDX(state, gridi, idx);

             if (is_s) {