virtio: do not export "u16" and "u64" to userspace

virtio_balloon.h exports "u16" and "u64" to userspace. Use "__u16" and
"__u64" instead.

Signed-off-by: Paul Bolle <pebolle@tiscali.nl>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
MAINTAINERS: add missing entries for virtio

Some head files were split or moved to uapi/ without
updating MAINTAINERS.

Signed-off-by: Amos Kong <kongjianjun@gmail.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
caif_virtio: fix error return code in cfv_create_genpool()

Fix to return a negative error code from the error handling
case instead of 0, as returned elsewhere in this function.

Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Acked-by: Sjur Brændeland <sjur.brandeland@stericsson.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>