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crc8() does not change the data passed to it, so the pointer argument
should be declared const.  This avoids callers that receive const data
having to cast it to a non-const pointer to call crc8().

Link: https://lkml.kernel.org/r/20210329122409.3291-1-rf@opensource.cirrus.com

Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>