Fix typo pointed out by Duncan Murdoch <murdoch.duncan@gmail.com>
Fix typo pointed out by Duncan Murdoch <murdoch.duncan@gmail.com>

mhunter1/OpenMx,jpritikin/OpenMx,jpritikin/OpenMx,jpritikin/OpenMx,mhunter1/OpenMx,jpritikin/OpenMx,mhunter1/OpenMx,jpritikin/OpenMx,mhunter1/OpenMx,mhunter1/OpenMx,mhunter1/OpenMx,jpritikin/OpenMx