isdn: use the common ascii hex helpers

Signed-off-by: Harvey Harrison <[e-mail]>
Acked-by: Karsten Keil <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/isdn/gigaset/isocdata.c

···
 #ifdef CONFIG_GIGASET_DEBUG
 	unsigned char c;
 	static char dbgline[3 * 32 + 1];
-	static const char hexdigit[] = "0123456789abcdef";
 	int i = 0;
 	while (count-- > 0) {
 		if (i > sizeof(dbgline) - 4) {
···
 		c = *bytes++;
 		dbgline[i] = (i && !(i % 12)) ? '-' : ' ';
 		i++;
-		dbgline[i++] = hexdigit[(c >> 4) & 0x0f];
-		dbgline[i++] = hexdigit[c & 0x0f];
+		dbgline[i++] = hex_asc_hi(c);
+		dbgline[i++] = hex_asc_lo(c);
 	}
 	dbgline[i] = '\0';
 	gig_dbg(level, "%s:%s", tag, dbgline);