This way, we don't need to count every time, so we're a little bit
faster and code is a little bit smaller.

Change suggested by Ville Syrjälä.
Reviewed-by: NRob Clark <rob.clark@linaro.org>
Tested-by: NRob Clark <rob.clark@linaro.org>
Signed-off-by: NPaulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>