Merge branch 'isdn-gigaset-fixes'

Tilman Schmidt says:

====================
Fix long-standing regression in ser_gigaset ISDN driver

This series fixes a serious regression in the Gigaset M101 driver
introduced in kernel release 3.10 and removes some unneeded code.

Please also queue up patch 1 of the series for inclusion in the
stable/longterm releases 3.10 and later.
====================

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