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Bug fix from James H: prevent LINEWIDTH ever reaching zero.

[originally from svn r6331]

--- a/loopy.c

+++ b/loopy.c

@@ -66,7 +66,7 @@

 #define PREFERRED_TILE_SIZE 32

 #define TILE_SIZE (ds->tilesize)

-#define LINEWIDTH TILE_SIZE / 16

+#define LINEWIDTH (ds->linewidth)

 #define BORDER (TILE_SIZE / 2)

 #define FLASH_TIME 0.5F

@@ -2078,7 +2078,7 @@

 struct game_drawstate {

     int started;

-    int tilesize;

+    int tilesize, linewidth;

     int flashing;

     char *hl, *vl;

     char *clue_error;

@@ -2360,6 +2360,7 @@

 			  game_params *params, int tilesize)

 {

     ds->tilesize = tilesize;

+    ds->linewidth = max(1,tilesize/16);

 }

 static float *game_colours(frontend *fe, game_state *state, int *ncolours)

@@ -2388,7 +2389,7 @@

 {

     struct game_drawstate *ds = snew(struct game_drawstate);

-    ds->tilesize = 0;

+    ds->tilesize = ds->linewidth = 0;

     ds->started = 0;

     ds->hl = snewn(HL_COUNT(state), char);

     ds->vl = snewn(VL_COUNT(state), char);