(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]
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);
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) {