drm/i915/ringbuffer: Fix emit batch buffer regression from 8187a2b

In commit 8187a2b, the number of dwords used in the ringbuffer for
executing the batch buffer was erroneously changed from 2 to 4.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2010-10-21 18:51:09 +01:00
commit c717966744