fix bug in fft cache size modification
fix bug in fft cache size modification

9prady9/arrayfire,umar456/arrayfire,munnybearz/arrayfire,arrayfire/arrayfire,arrayfire/arrayfire,umar456/arrayfire,umar456/arrayfire,umar456/arrayfire,munnybearz/arrayfire,munnybearz/arrayfire,arrayfire/arrayfire,arrayfire/arrayfire,9prady9/arrayfire,9prady9/arrayfire,9prady9/arrayfire