UPSTREAM: dmaengine: core: Skip mask matching when it is not provided to private_cand...

UPSTREAM: dmaengine: core: Skip mask matching when it is not provided to private_candidate

If mask is NULL skip the mask matching against the DMA device capabilities.

Change-Id: Iee44026c8d43493e4e73d8d483545267dc2e08a7
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Caesar Wang <wxt@rock-chips.com>
(cherry picked from git.kernel.org next/linux-next.git master
 commit 26b64256e0c4573f3668ac8329a1266ebb9d6120)