Return zero in cross_sizeof
Return zero in cross_sizeof

There is an error when compiling with -Werror=return-type. Non void
functions must return valid values.

pexip/meson,jpakkane/meson,pexip/meson,becm/meson,mesonbuild/meson,mesonbuild/meson,pexip/meson,becm/meson,pexip/meson,jpakkane/meson,mesonbuild/meson,pexip/meson,QuLogic/meson,becm/meson,becm/meson,jpakkane/meson,jpakkane/meson,jpakkane/meson,mesonbuild/meson,jpakkane/meson,pexip/meson,becm/meson,becm/meson,mesonbuild/meson,pexip/meson,mesonbuild/meson,QuLogic/meson,QuLogic/meson,jpakkane/meson,pexip/meson,QuLogic/meson,mesonbuild/meson,QuLogic/meson,pexip/meson,becm/meson,jpakkane/meson,mesonbuild/meson,QuLogic/meson,mesonbuild/meson,QuLogic/meson,becm/meson,QuLogic/meson,becm/meson,mesonbuild/meson,QuLogic/meson,jpakkane/meson,pexip/meson,becm/meson