caif: handle snprintf() return
snprintf() returns the number of bytes that would have been written. It can be larger than the size of the buffer. The current code won't overflow, but people cut and paste this stuff so lets do it right and also make the static checkers happy. Signed-off-by: NDan Carpenter <error27@gmail.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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