Fix comparison warnings
Fix comparison warnings

bkloppenborg/arrayfire,pentschev/arrayfire,shehzan10/arrayfire,shehzan10/arrayfire,merlin-ext/arrayfire,arrayfire/arrayfire,pentschev/arrayfire,marbre/arrayfire,9prady9/arrayfire,bkloppenborg/arrayfire,arrayfire/arrayfire,marbre/arrayfire,umar456/arrayfire,merlin-ext/arrayfire,hshindo/arrayfire,umar456/arrayfire,pentschev/arrayfire,hshindo/arrayfire,hshindo/arrayfire,bkloppenborg/arrayfire,ghisvail/arrayfire,victorv/arrayfire,umar456/arrayfire,munnybearz/arrayfire,arrayfire/arrayfire,victorv/arrayfire,merlin-ext/arrayfire,bkloppenborg/arrayfire,victorv/arrayfire,merlin-ext/arrayfire,ghisvail/arrayfire,hshindo/arrayfire,arrayfire/arrayfire,ghisvail/arrayfire,9prady9/arrayfire,marbre/arrayfire,9prady9/arrayfire,munnybearz/arrayfire,shehzan10/arrayfire,munnybearz/arrayfire,marbre/arrayfire,umar456/arrayfire,9prady9/arrayfire,shehzan10/arrayfire,ghisvail/arrayfire,victorv/arrayfire,pentschev/arrayfire