drivers: isdn: use new hex_to_bin() method
Remove own implementation of hex_to_bin(). Signed-off-by: Andy Shevchenko <ext-andriy.shevchenko@nokia.com> Acked-by: Tilman Schmidt <tilman@imap.cc> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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