rogue: fix is_digit prototype

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rogue: fix is_digit prototype

Alexey Dobriyan-2
Index: games/rogue//rogue.h
===================================================================
RCS file: /cvs/src/games/rogue/rogue.h,v
retrieving revision 1.15
diff -u -p -r1.15 rogue.h
--- games/rogue//rogue.h 2006/03/06 04:41:18 1.15
+++ games/rogue//rogue.h 2006/03/07 14:05:19
@@ -565,7 +565,7 @@ void inv_armor_weapon(boolean);
 void inv_rings(void);
 void inventory(object *, unsigned short);
 boolean is_all_connected(void);
-boolean is_digit(int);
+boolean is_digit(short);
 boolean is_direction(short, short *);
 boolean is_pack_letter(short *, unsigned short *);
 boolean is_passable(short, short);