ensure mksobj() always attaches timer

Previously, if mksobj() was called with the 1st argument
having a value of CORPSE, and a second argument (init)
set to FALSE, the corpse would never get a timer attached.

src/mkobj.c

@@ -416,7 +416,7 @@ boolean artif;
 		   this level; let's create an adventurer's corpse instead, then */
 			otmp->corpsenm = PM_HUMAN;
 		}
-		start_corpse_timeout(otmp);
+		/* timer set below */
 		break;
 	    case EGG:
 		otmp->corpsenm = NON_PM;	/* generic egg */
@@ -617,6 +617,14 @@ boolean artif;
 						objects[otmp->otyp].oc_class);
 		return (struct obj *)0;
 	}
+
+	/* Some things must get done (timers) even if init = 0 */
+	switch (otmp->otyp) {
+	    case CORPSE:
+		start_corpse_timeout(otmp);
+		break;
+	}
+
 	/* unique objects may have an associated artifact entry */
 	if (objects[otyp].oc_unique && !otmp->oartifact)
 	    otmp = mk_artifact(otmp, (aligntyp)A_NONE);