Replace a deleted comment, check parent is not NULL before using it.

src/apps/deskbar/BarView.cpp

@@ -349,6 +349,7 @@ TBarView::MouseDown(BPoint where)
 void
 TBarView::PlaceDeskbarMenu()
 {
+	// top or bottom, full
 	if (!fVertical && fBarMenuBar != NULL) {
 		fBarMenuBar->RemoveSelf();
 		delete fBarMenuBar;

src/apps/deskbar/ScrollArrowView.cpp

@@ -125,8 +125,12 @@ UpScrollArrow::MouseDown(BPoint where)
 	if (!IsEnabled())
 		return;
 
-	dynamic_cast<TScrollArrowView*>(Parent())->ScrollBy(-kDefaultScrollStep);
-	snooze(5000);
+	TScrollArrowView* parent = dynamic_cast<TScrollArrowView*>(Parent());
+
+	if (parent != NULL) {
+		parent->ScrollBy(-kDefaultScrollStep);
+		snooze(5000);
+	}
 }
 
 
@@ -177,8 +181,10 @@ DownScrollArrow::MouseDown(BPoint where)
 	TScrollArrowView* grandparent
 		= dynamic_cast<TScrollArrowView*>(Parent()->Parent());
 
-	grandparent->ScrollBy(kDefaultScrollStep);
-	snooze(5000);
+	if (grandparent != NULL) {
+		grandparent->ScrollBy(kDefaultScrollStep);
+		snooze(5000);
+	}
 }