Add a missing return statement.

Bug: 206518114
Test: manual
Change-Id: Iadb13f6b64e19fef84310aeefd39c5e4d71d1882

services/usage/java/com/android/server/usage/UsageStatsService.java

@@ -1814,6 +1814,7 @@ public class UsageStatsService extends SystemService implements
                     synchronized (mLock) {
                         mResponseStatsTracker.dump(idpw);
                     }
+                    return;
                 } else if (arg != null && !arg.startsWith("-")) {
                     // Anything else that doesn't start with '-' is a pkg to filter
                     pkgs.add(arg);