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Fix parenthesis problem in Light Up solver. Should fix Debian bug
#505359.

[originally from svn r8342]

--- a/lightup.c

+++ b/lightup.c

@@ -1016,9 +1016,9 @@

     get_surrounds(state, x, y, &s);

     for (i = 0; i < s.npoints; i++) {

-        if (!GRID(state,flags,s.points[i].x,s.points[i].y) & F_NUMBERED)

+        if (!(GRID(state,flags,s.points[i].x,s.points[i].y) & F_NUMBERED))

             continue;

-        /* we have an adjacent clue square; find /it's/ surrounds

+        /* we have an adjacent clue square; find /its/ surrounds

          * and count the remaining lights it needs. */

         get_surrounds(state,s.points[i].x,s.points[i].y,&ss);

         curr_lights = 0;