Sunsword kept glowing after monster wielding it died

- <Someone> reported this bug to the mailing list
- add a check in relobj(), which should catch all the cases

doc/fixes34.1

@@ -22,6 +22,7 @@ discovering a mimic on a closed door location should not unblock the location
 don't drop corpse when a monster kills another monster on an inaccessible
 	location (i.e. behave like xkilled behaves)
 half-physical-damage from gas spore explosion should only affect you
+Sunsword didn't stop glowing when hero killed a monster wielding it
 
 
 Platform- and/or Interface-Specific Fixes

src/steal.c

@@ -543,6 +543,8 @@ boolean is_pet;		/* If true, pet should keep wielded/worn items */
 			    costly_spot(mtmp->mx, mtmp->my))
 				otmp->no_charge = 1;
 #endif
+			if (otmp->owornmask & W_WEP)
+			    setmnotwielded(mtmp, otmp);
 			otmp->owornmask = 0L;
 		}
 		if (is_pet && cansee(omx, omy) && flags.verbose)