more update_inventory calls

in passive_obj and erode_armor

src/do_wear.c

@@ -1636,6 +1636,7 @@ boolean acid_dmg;
 
 	if (otmph && (otmph != uarmf)) {
 	    erode_obj(otmph, acid_dmg, FALSE);
+	    if (carried(otmph)) update_inventory();
 	}
 }
 

src/uhitm.c

@@ -2184,6 +2184,8 @@ struct attack *mattk;		/* null means we find one internally */
 	  default:
 	    break;
 	}
+
+	if (carried(obj)) update_inventory();
 }
 
 /* Note: caller must ascertain mtmp is mimicking... */