dma-buf: Adjust a null pointer check in dma_buf_attach()
The script "checkpatch.pl" pointed information out like the following. Comparison to NULL could be written "!attach" Thus adjust this expression. Signed-off-by: Markus Elfring <elfring@users.sourceforge.net> Reviewed-by: Gustavo Padovan <gustavo.padovan@collabora.com> Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
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