Fix leak in SIFT test
Fix leak in SIFT test

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