Bug 1551410 - Part 1: increment loop index; r=chutten

Differential Revision: https://phabricator.services.mozilla.com/D31045

--HG--
extra : moz-landing-system : lando

toolkit/components/telemetry/core/TelemetryOrigin.cpp

@@ -234,7 +234,7 @@ nsresult AppEncodeTo(const StaticMutexAutoLock& lock,
         }
       }
       aResult.AppendElement(MakePair(id, metricData));
-    } while (generation < maxGeneration);
+    } while (generation++ < maxGeneration);
   }
   return NS_OK;
 }