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H A Ddsp_dtmf.cdiff efef50a59f5536b94953838b05472eb490f6be09 Mon Apr 23 21:51:51 CDT 2012 Karsten Keil <isdn@linux-pingi.de> mISDN: Fix division by zero

If DTMF debug is set and tresh goes under 100, the printk will cause
a division by zero.

Signed-off-by: Karsten Keil <kkeil@linux-pingi.de>
Signed-off-by: David S. Miller <davem@davemloft.net>