Fix validity check for IntSwitch

Change-Id: Iedfea8b51d1f8f5d0e5affb2a35e600edfc5445c
diff --git a/src/main/java/com/android/tools/r8/ir/code/IntSwitch.java b/src/main/java/com/android/tools/r8/ir/code/IntSwitch.java
index d5a83f5..e0e3cdc 100644
--- a/src/main/java/com/android/tools/r8/ir/code/IntSwitch.java
+++ b/src/main/java/com/android/tools/r8/ir/code/IntSwitch.java
@@ -63,7 +63,7 @@
     assert keys.length <= Constants.U16BIT_MAX;
     // Keys must be acceding, and cannot target the fallthrough.
     assert keys.length == numberOfKeys();
-    for (int i = 1; i < keys.length - 1; i++) {
+    for (int i = 1; i < keys.length; i++) {
       assert keys[i - 1] < keys[i];
     }
     return true;