There are several places where descriptors are freed using identical code.
This patch puts this code into a function to reduce code duplication.
Signed-off-by: NHongbo Zhang <hongbo.zhang@freescale.com>
Signed-off-by: NQiang Liu <qiang.liu@freescale.com>
Signed-off-by: NVinod Koul <vinod.koul@intel.com>