SourceCode error in MouseController Example

[kuhnm]

On a Due in teh IDE 1.5.1r2 there is an error in the MouseController sample of the UsbHost. When compiling I get
MouseController.ino: In function 'void mouseReleased()':
MouseController:66: error: 'left' was not declared in this scope
MouseController:70: error: 'middle' was not declared in this scope
MouseController:74: error: 'right' was not declared in this scope
The three variables should be leftButton, middleButton, rightButton like in the rest of the source code.