fix some test fails related to pre callback
fix some test fails related to pre callback

liebharc/clFFT,liebharc/clFFT,kknox/clFFT,clMathLibraries/clFFT,liebharc/clFFT,liebharc/clFFT,kknox/clFFT,arrayfire/clFFT,9prady9/clFFT,ghisvail/clFFT,9prady9/clFFT,9prady9/clFFT,ghisvail/clFFT,clMathLibraries/clFFT,arrayfire/clFFT,clMathLibraries/clFFT,ghisvail/clFFT,arrayfire/clFFT,kknox/clFFT