dw_dmac: remove redundant check

There is no need to check the callback_required parameter, due to we check the
callback pointer to be a non-NULL.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
1 file changed