Fix the build.

Change-Id: I71d1d9958182966d2eff0d34fa05ac57f2cabc48
diff --git a/core/java/android/net/NetworkUtils.java b/core/java/android/net/NetworkUtils.java
index 72ea02e..5f573bb 100644
--- a/core/java/android/net/NetworkUtils.java
+++ b/core/java/android/net/NetworkUtils.java
@@ -267,7 +267,7 @@
         String result = null;
         for (int i = 0; i < 4; i++) {
             try {
-                if (octets[i].length > 3) return addr;
+                if (octets[i].length() > 3) return addr;
                 builder.append(Integer.parseInt(octets[i]));
             } catch (NumberFormatException e) {
                 return addr;