When client request a non existing channel from of_dma_xilinx_xlate
we get a NULL pointer dereferencing. This patch fix this problem.
Signed-off-by: NFranck Jullien <franck.jullien@odyssee-systemes.fr>
Acked-by: NLaurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: NVinod Koul <vinod.koul@intel.com>