isdn: fix random hard freeze with AVM cards using b1dma
isdn: fix random hard freeze with AVM cards using b1dma

This fixes the hard freeze debugded for AVM C4 cards using the b1dma
interface.

[5c1e68b099950c134891f0b6e179498a8ebe9cf9@linux-foundation.org: coding-style fixes]
Signed-off-by: Karsten Keil <90bd3ab5dfafb0210c2bd99c94885684b79eea73@suse.de>
Signed-off-by: Andrew Morton <5c1e68b099950c134891f0b6e179498a8ebe9cf9@linux-foundation.org>
Signed-off-by: Linus Torvalds <69652caca27c8b940640ad396ab71f93cacec34f@linux-foundation.org>

KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs