dma: of: Fix of_node reference leak
of_dma_request_slave_channel() currently does not drop the reference to the dma_spec of_node if no DMA controller matching the of_node could be found. This patch fixes it by always calling of_node_put(). Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Acked-by: Arnd Bergmann <arnd@arndb.de> Reviewed-by: Jon Hunter <jon-hunter@ti.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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