As we release the head requests back into the queue, propagate any
change in error status that may have occurred while the requests were
temporarily suspended.

Closes: https://gitlab.freedesktop.org/drm/intel/issues/1277Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200304121849.2448028-2-chris@chris-wilson.co.uk