isdn: fix strlen() usage
There was a missing "else" statement so the original code overflowed if ->master->name was too long. Also the ->slave and ->master buffers can hold names with 9 characters and a NULL so I cleaned it up to allow another character. Signed-off-by: NDan Carpenter <error27@gmail.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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