caif: added check for potential null return
Add check on NULL return from caif_get(). Signed-off-by: NKim Lilliestierna <Kim.xx.Lilliestierna@stericsson.com> Signed-off-by: NSjur Brændeland <sjur.brandeland@stericssion.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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