[FLINK-7644] [runtime] Remove double semicolon.

This closes #4692.

flink-runtime/src/main/java/org/apache/flink/runtime/checkpoint/CheckpointStatsTracker.java

@@ -429,7 +429,7 @@ public class CheckpointStatsTracker {
 	private class LatestCompletedCheckpointAlignmentBufferedGauge implements Gauge<Long> {
 		@Override
 		public Long getValue() {
-			CompletedCheckpointStats completed = latestCompletedCheckpoint;;
+			CompletedCheckpointStats completed = latestCompletedCheckpoint;
 			if (completed != null) {
 				return completed.getAlignmentBuffered();
 			} else {

flink-runtime/src/test/java/org/apache/flink/runtime/state/heap/CopyOnWriteStateTableTest.java

@@ -396,8 +396,8 @@ public class CopyOnWriteStateTableTest extends TestLogger {
 	public void testSerializerDuplicationInSnapshot() throws IOException {
 
 		final TestDuplicateSerializer namespaceSerializer = new TestDuplicateSerializer();
-		final TestDuplicateSerializer stateSerializer = new TestDuplicateSerializer();;
-		final TestDuplicateSerializer keySerializer = new TestDuplicateSerializer();;
+		final TestDuplicateSerializer stateSerializer = new TestDuplicateSerializer();
+		final TestDuplicateSerializer keySerializer = new TestDuplicateSerializer();
 
 		RegisteredKeyedBackendStateMetaInfo<Integer, Integer> metaInfo =
 			new RegisteredKeyedBackendStateMetaInfo<>(