mISDN: Fix NULL pointer bug in if-condition of mISDN_dsp
mISDN: Fix NULL pointer bug in if-condition of mISDN_dsp

Fix a bug (was introduced by a cut & paste error)
in cases when dsp->conf was NULL.

Signed-off-by: Andreas Eversberg <cf4246301d762e89cb189af00812aa53bb6d9a44@eversberg.eu>
Signed-off-by: Karsten Keil <6c650a0c03db7489bc4603bcbf5e90336cce5ee8@b1-systems.de>
Signed-off-by: David S. Miller <fe08d3c717adf2ae63592e4c9aec6e3e404d8e3e@davemloft.net>

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