Use the header length instead of array length when iterating over GLB chunks

examples/js/loaders/GLTFLoader.js

@@ -899,10 +899,11 @@ THREE.GLTFLoader = ( function () {
 
 		}
 
+		var chunkContentsLength = this.header.length - BINARY_EXTENSION_HEADER_LENGTH;
 		var chunkView = new DataView( data, BINARY_EXTENSION_HEADER_LENGTH );
 		var chunkIndex = 0;
 
-		while ( chunkIndex < chunkView.byteLength ) {
+		while ( chunkIndex < chunkContentsLength ) {
 
 			var chunkLength = chunkView.getUint32( chunkIndex, true );
 			chunkIndex += 4;

examples/jsm/loaders/GLTFLoader.js

@@ -964,10 +964,11 @@ var GLTFLoader = ( function () {
 
 		}
 
+		var chunkContentsLength = this.header.length - BINARY_EXTENSION_HEADER_LENGTH;
 		var chunkView = new DataView( data, BINARY_EXTENSION_HEADER_LENGTH );
 		var chunkIndex = 0;
 
-		while ( chunkIndex < chunkView.byteLength ) {
+		while ( chunkIndex < chunkContentsLength ) {
 
 			var chunkLength = chunkView.getUint32( chunkIndex, true );
 			chunkIndex += 4;