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docs: DMA-API-HOWTO.txt: fix an unmarked code block
When building with Sphinx, it would produce this warning: docs/Documentation/DMA-API-HOWTO.rst:222: WARNING: Definition list ends without a blank line; unexpected unindent. Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
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@ -212,7 +212,7 @@ The standard 64-bit addressing device would do something like this::
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If the device only supports 32-bit addressing for descriptors in the
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coherent allocations, but supports full 64-bits for streaming mappings
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it would look like this:
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it would look like this::
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if (dma_set_mask(dev, DMA_BIT_MASK(64))) {
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dev_warn(dev, "mydev: No suitable DMA available\n");
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