Currently they return -1 on error, which will confuse callers if
they try to interpret it as a normal negative error code.
Signed-off-by: NAndy Lutomirski <luto@kernel.org>
Signed-off-by: NDarren Hart (VMware) <dvhart@infradead.org>
Signed-off-by: NJean Delvare <jdelvare@suse.de>