Use short' instead of unsigned short' for item storage in places

that were missed in the original changeset.

src/lib/common/damage.c

@@ -50,7 +50,7 @@
 #include "subs.h"
 
 void
-item_damage(int pct, u_short *item)
+item_damage(int pct, short *item)
 {
     int i, lose;