function unbindTransformFeedbackInfo(gl, transformFeedbackInfo, bufferInfo) {
	    if (transformFeedbackInfo.transformFeedbackInfo) {
	      transformFeedbackInfo = transformFeedbackInfo.transformFeedbackInfo;
	    }
	    if (bufferInfo.attribs) {
	      bufferInfo = bufferInfo.attribs;
	    }
	    for (var name in bufferInfo) {
	      var varying = transformFeedbackInfo[name];
	      if (varying) {
	        gl.bindBufferBase(gl.TRANSFORM_FEEDBACK_BUFFER, varying.index, null);
	      }
	    }
	  }
Unbinds buffers afetr transform feedback.

Buffers can not be bound to 2 bind points so if you try to bind a buffer used
in a transform feedback as an ARRAY_BUFFER for an attribute it will fail.

This function unbinds all buffers that were bound with {@link module:twgl.bindTransformFeedbackInfo}.

@param {WebGLRenderingContext} gl The WebGLRenderingContext to use.
@param {(module:twgl.ProgramInfo|Object<string, module:twgl.TransformFeedbackInfo>)} transformFeedbackInfo A ProgramInfo or TransformFeedbackInfo.
@param {(module:twgl.BufferInfo|Object<string, module:twgl.AttribInfo>)} [bufferInfo] A BufferInfo or set of AttribInfos.