NullPointerException in AbsListView.focusSearch().

1. One of the loops was using the last visible position
   as its end boundary as opposed to the child count
   minus one.

bug:6610451

Change-Id: I600545ca3f64d1e982f909f893e5d34570ec5c8b

Author: sganov

core/java/android/widget/AbsListView.java

@@ -1388,7 +1388,7 @@ public View focusSearch(View focused, int direction) {
                 }
                 // Try to move focus to the next item.
                 final int nextPosition = currentPosition - getFirstVisiblePosition() + 1;
-                for (int i = nextPosition; i <= getLastVisiblePosition(); i++) {
+                for (int i = nextPosition; i < getChildCount(); i++) {
                     View child = getChildAt(i);
                     if (child.getVisibility() == View.VISIBLE) {
                         return child;