default: break;
case XA_WM_TRANSIENT_FOR:
if(!c->isfloating && (XGetTransientForHint(dpy, c->win, &trans)) &&
- (c->isfloating = (wintoclient(trans))))
+ (c->isfloating = (wintoclient(trans)) != NULL))
arrange(c->mon);
break;
case XA_WM_NORMAL_HINTS: