Remove the unnecessary assertion

Author: dungba88

lucene/core/src/java/org/apache/lucene/util/fst/NodeHash.java

@@ -134,14 +134,12 @@ public long add(FSTCompiler.UnCompiledNode<T> nodeIn) throws IOException {
           // freeze & add
           node = fstCompiler.addNode(nodeIn);
 
+          // we use 0 as empty marker in hash table, so it better be impossible to get a frozen node
+          // at 0:
           assert node != FST.FINAL_END_NODE && node != FST.NON_FINAL_END_NODE;
           byte[] buf = new byte[Math.toIntExact(node - startAddress + 1)];
           fstCompiler.bytes.copyBytes(startAddress, buf, 0, buf.length);
 
-          // we use 0 as empty marker in hash table, so it better be impossible to get a frozen node
-          // at 0:
-          assert node != 0;
-
           primaryTable.set(pos, node, buf);
 
           // confirm frozen hash and unfrozen hash are the same