U423 - uninitialized memory access in dolookup

fix a case where "cc", which is only set when looking from_screen,
in a case where from_screen is not set.

doc/fixes34.2

@@ -42,6 +42,7 @@ avoid impossible after eating the object the hero is hiding under
 failed attempt to eat floor gold while polymorphed would lose the gold
 running that stops for closed doors should stop at mimics mimicking closed doors
 allow wishing for magenta potions (ignoring the rank name 'mage')
+fix an uninitialized memory access in non-quick dolookup
 
 
 Platform- and/or Interface-Specific Fixes

src/pager.c

@@ -674,7 +674,7 @@ do_look(quick)
 		}
 		/* Kludge: warning trumps boulders on the display.
 		   Reveal the boulder too or player can get confused */
-		if (sobj_at(BOULDER, cc.x, cc.y))
+		if (from_screen && sobj_at(BOULDER, cc.x, cc.y))
 			Strcat(out_str, " co-located with a boulder");
 		break;	/* out of for loop*/
 	    }