Commit ef859312 ("dmaengine: core: Use dev_ functions for debug and
error prints") wasn't quite right in __dma_request_channel() by claiming
that all pr_ prints have valid DMA channel pointer. Obviously it is not
true as __dma_request_channel() is looking for a channel and returns NULL
if it does not find it.

Prevent this potential NULL pointer dereference by reverting back to
pr_debug().
Signed-off-by: NJarkko Nikula <jarkko.nikula@linux.intel.com>
Reported-by: NDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: NVinod Koul <vinod.koul@intel.com>