conform/script: Add the return type for the margin test
conform/script: Add the return type for the margin test

The compiler would default to 'int', and warn - and then warn again
because the function would not return a value.

Distrotech/clutter,djdeath/clutter-android,djdeath/clutter,collects/clutter,ebassi/clutter,jigpu/clutter,Distrotech/clutter,heysion/clutter-clone,ebassi/clutter,jigpu/clutter,heysion/clutter-clone,djdeath/clutter,collects/clutter,heysion/clutter-clone,ebassi/clutter,jigpu/clutter,djdeath/clutter-android,Distrotech/clutter,jigpu/clutter,djdeath/clutter-android,ebassi/clutter,djdeath/clutter,jigpu/clutter,djdeath/clutter-android,ebassi/clutter,Distrotech/clutter,djdeath/clutter,djdeath/clutter,GNOME/clutter,djdeath/clutter-android,heysion/clutter-clone,djdeath/clutter,heysion/clutter-clone,jigpu/clutter,GNOME/clutter,GNOME/clutter,Distrotech/clutter,collects/clutter,GNOME/clutter,collects/clutter,collects/clutter,GNOME/clutter,Distrotech/clutter