tree b0d88e136f638d5586e0453a448c25ae743dc850
parent 7f340ff89595c397153d0e485cbddd8562dc8a0e
author Pekka Paalanen <pekka.paalanen@collabora.co.uk> 1490875885 +0300
committer Pekka Paalanen <pekka.paalanen@collabora.co.uk> 1500988121 +0300

libweston: prevent double weston_output_enable()

Enabling an already enabled output is an error, at least with the
current implementation.

However, disabling an output that has not been enabled is ok.

Cope with the first and document the second.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Reviewed-by: Armin Krezović <krezovic.armin@gmail.com>