Derek Foreman authored Sep 19, 2014 and Pekka Paalanen committed Sep 22, 2014

Calling weston_output_mode_switch() with WESTON_MODE_SWITCH_RESTORE_NATIVE
will result in the mode being set "back" to the passed in mode - so the
passed mode should be the native mode.

Additionally, weston_output_mode_switch() should be called when
output->original_mode is non-NULL (which indicates we had a temporary
mode set).  The comparison to current_mode results in a lot of
log chatter.

Acked-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>