drm/i915: Don't return busy for buffers left on the flushing list.

drm/i915: Don't return busy for buffers left on the flushing list.

These buffers don't have active rendering still occurring to them, they just
need either a flush to be emitted or a retire_requests to occur so that we
notice they're done.  Return unbusy so that one of the two occurs.  The two
expected consumers of this interface (OpenGL and libdrm_intel BO cache) both
want this behavior.

Signed-off-by: Eric Anholt <[email protected]>
Acked-by: Keith Packard <[email protected]>
Signed-off-by: Dave Airlie <[email protected]>