Fix:	SE019

Problem:
	Slash'EM can crash with a bad memory reference when forcing
	a lock with a weapon.

Compatible with:
	Slash'EM 0.0.5E2 through 0.0.5E6F1

Author: Warren Cheung, wac@intergate.bc.ca
	J. Ali Harlow, ali@avrc.city.ac.uk

Date:	2 Nov 1999

*** src/lock.c.orig	Mon Nov  1 12:47:58 1999
--- src/lock.c	Tue Nov  2 12:01:32 1999
***************
*** 599,605 ****
  			You("start bashing it with your %s.", xname(uwep));
  		    xlock.box = otmp;
  		    xlock.chance = (is_lightsaber(uwep) ? 75 :
! 			  objects[otmp->otyp].oc_wldam * 2);
  		    xlock.picktyp = picktyp;
  		    xlock.usedtime = 0;
  		    break;
--- 599,605 ----
  			You("start bashing it with your %s.", xname(uwep));
  		    xlock.box = otmp;
  		    xlock.chance = (is_lightsaber(uwep) ? 75 :
! 			  objects[uwep->otyp].oc_wldam * 2);
  		    xlock.picktyp = picktyp;
  		    xlock.usedtime = 0;
  		    break;
***************
*** 655,661 ****
  			You("start bashing it with your %s.", xname(uwep));
  		    xlock.box = otmp;
  		    xlock.chance = (is_lightsaber(uwep) ? 38 :
! 			  objects[otmp->otyp].oc_wldam);
  		    xlock.picktyp = picktyp;
  		    xlock.usedtime = 0;    
  		    xlock.door = door;
--- 655,661 ----
  			You("start bashing it with your %s.", xname(uwep));
  		    xlock.box = otmp;
  		    xlock.chance = (is_lightsaber(uwep) ? 38 :
! 			  objects[uwep->otyp].oc_wldam);
  		    xlock.picktyp = picktyp;
  		    xlock.usedtime = 0;    
  		    xlock.door = door;