[SUREFIRE-2056] Fix buffer overflow in EventChannelEncoder when the t…

…est ID is null

surefire-booter/src/main/java/org/apache/maven/surefire/booter/spi/EventChannelEncoder.java

@@ -393,7 +393,7 @@ ByteBuffer encodeMessage( ForkedProcessEventType eventType, RunMode runMode, Lon
     {
         CharsetEncoder encoder = newCharsetEncoder();
         int bufferMaxLength = estimateBufferLength( eventType.getOpcode().length(), runMode, encoder, 0,
-            testRunId == null ? 0 : 1, message );
+            1, message );
         ByteBuffer result = ByteBuffer.allocate( bufferMaxLength );
         encode( encoder, result, eventType, runMode, testRunId, message );
         return result;