dma: dw: improve comparison with ~0
In general ~0 does not fit some integer types. Let's do a helper to make a comparison with that constant properly. Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com> Acked-by: NViresh Kumar <viresh.kumar@linaro.org> Signed-off-by: NVinod Koul <vinod.koul@intel.com>
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