drivers: isdn: use kernel macros to convert hex digit

Signed-off-by: Andy 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: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 5 deletions

diff --git a/drivers/isdn/capi/capidrv.c b/drivers/isdn/capi/capidrv.c
index bf55ed5f38e3..2978bdaa6b88 100644
--- a/drivers/isdn/capi/capidrv.c
+++ b/drivers/isdn/capi/capidrv.c
@@ -1450,12 +1450,9 @@ static void handle_dtrace_data(capidrv_contr *card,
         }
 
         for (p = data, end = data+len; p < end; p++) {
-                u8 w;
                 PUTBYTE_TO_STATUS(card, ' ');
-                w = (*p >> 4) & 0xf;
-                PUTBYTE_TO_STATUS(card, (w < 10) ? '0'+w : 'A'-10+w);
-                w = *p & 0xf;
-                PUTBYTE_TO_STATUS(card, (w < 10) ? '0'+w : 'A'-10+w);
+                PUTBYTE_TO_STATUS(card, hex_asc_hi(*p));
+                PUTBYTE_TO_STATUS(card, hex_asc_lo(*p));
         }
         PUTBYTE_TO_STATUS(card, '\n');