egl/dri2: Avoid sign extension when building modifier

Since the EGL attributes are signed integers, a straight OR would
also perform sign extension,

Fixes: 6f10e7c37a ("egl/dri2: Create EGLImages with dmabuf modifiers")
Reviewed-by: Eric Engestrom <eric.engestrom@imgtec.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
1 file changed