drivers: isdn: use kernel macros to convert hex digit
Signed-off-by: NAndy Shevchenko <andy.shevchenko@gmail.com> Cc: Karsten Keil <isdn@linux-pingi.de> Cc: Tilman Schmidt <tilman@imap.cc> Cc: netdev@vger.kernel.org Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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