TypeScript: read vtable entries as uint16

Author: jtbandes

ts/byte-buffer.ts

@@ -192,8 +192,8 @@ export class ByteBuffer {
    */
   __offset(bb_pos: number, vtable_offset: number): Offset {
     const vtable = bb_pos - this.readInt32(bb_pos);
-    return vtable_offset < this.readInt16(vtable)
-      ? this.readInt16(vtable + vtable_offset)
+    return vtable_offset < this.readUint16(vtable)
+      ? this.readUint16(vtable + vtable_offset)
       : 0;
   }