Fix bug 14276128 Clipping at bottom of TextView

Avoid applying "extra" linespacing to the last line of a layout, because
when that is negative, it causes clipping.

Change-Id: I4cc8792fd3444e4118604cc3d0f816d59dfc1e74

core/java/android/text/StaticLayout.java

@@ -654,7 +654,7 @@ public class StaticLayout extends Layout {
 
         int extra;
 
-        if (needMultiply) {
+        if (needMultiply && end != bufEnd) {
             double ex = (below - above) * (spacingmult - 1) + spacingadd;
             if (ex >= 0) {
                 extra = (int)(ex + EXTRA_ROUNDING);