In certain cases, dma_alloc_coherent returns NULL. Add check for
NULL pointer.
Signed-off-by: NSachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: NKamil Debski <k.debski@samsung.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>