Don't lose critical success/failure messages

Occasionally, "dumpsys connectivity --diag" will show measurement
results without success or failure messages.  Properly record the
error before decrementing the countdown latch.

Bug: 20733156
Change-Id: Ic654dedb753a65a96fe870f79fb296fbfc459fcb

services/core/java/com/android/server/connectivity/NetworkDiagnostics.java

@@ -113,18 +113,18 @@ public class NetworkDiagnostics {
 
         public void recordSuccess(String msg) {
             maybeFixupTimes();
+            result = SUCCEEDED + ": " + msg;
             if (mCountDownLatch != null) {
                 mCountDownLatch.countDown();
             }
-            result = SUCCEEDED + ": " + msg;
         }
 
         public void recordFailure(String msg) {
             maybeFixupTimes();
+            result = FAILED + ": " + msg;
             if (mCountDownLatch != null) {
                 mCountDownLatch.countDown();
             }
-            result = FAILED + ": " + msg;
         }
 
         private void maybeFixupTimes() {