test: fix an issue in loading YV12 surface
test: fix an issue in loading YV12 surface

pma1/libva,chenxianqin/vaapi-libva,01org/iotg-lin-gfx-libva,zzhhui/libva,pma1/libva,01org/libva-cros,01org/iotg-lin-gfx-libva,01org/libva-cros,zzhhui/libva,gbeauchesne/libva,pma1/libva,gbeauchesne/libva,01org/iotg-lin-gfx-libva,chenxianqin/vaapi-libva,01org/libva-cros,gbeauchesne/libva,zzhhui/libva,chenxianqin/vaapi-libva