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Undead: be a bit more careful about sprintf buffer sizes

--- a/undead.c

+++ b/undead.c

@@ -2429,7 +2429,7 @@

 static void draw_monster_count(drawing *dr, game_drawstate *ds,

                                const game_state *state, int c, bool hflash) {

     int dx,dy;

-    char buf[8];

+    char buf[MAX_DIGITS(int) + 1];

     char bufm[8];

     dy = TILESIZE/4;

@@ -2474,7 +2474,7 @@

                            const struct game_params *params,

                            int hint_index, bool hflash, int hint) {

     int x, y, color, dx, dy, text_dx, text_dy, text_size;

-    char buf[4];

+    char buf[MAX_DIGITS(int) + 1];

     if (ds->hint_errors[hint_index])

         color = COL_ERROR;