dma: of: Remove restriction that #dma-cells can't be 0
There is no sensible reason why #dma-cells shouldn't be allowed to be 0. It is completely up to the DMA controller how many additional parameters, besides the phandle, it needs to identify a channel. E.g. for DMA controller with only one channel or for DMA controllers which don't have a restriction on which channel can be used for which peripheral it completely legitimate to not require any additional parameters. Also fixes the following warning: drivers/dma/of-dma.c: In function 'of_dma_controller_register': drivers/dma/of-dma.c:67:7: warning: 'nbcells' may be used uninitialized in this function Signed-off-by: NLars-Peter Clausen <lars@metafoo.de> Acked-by: NArnd Bergmann <arnd@arndb.de> Signed-off-by: NVinod Koul <vinod.koul@intel.com>
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