compile error in isdn_ppp_mp.h (kernel 2.5.52)

Hi,

compiling kernel 2.5.52 stops with this:

gcc -Wp,-MD,drivers/isdn/i4l/.isdn_ppp.o.d -D__KERNEL__ -Iinclude -Wall -Wstrict-prototypes -Wno-trigraphs -O2 -fno-strict-aliasing -fno-common -pipe -mpreferred-stack-boundary=2 -march=i686 -malign-functions=4 -Iarch/i386/mach-generic -fomit-frame-pointer -nostdinc -iwithprefix include -DMODULE -DKBUILD_BASENAME=isdn_ppp -DKBUILD_MODNAME=isdn -c -o drivers/isdn/i4l/isdn_ppp.o drivers/isdn/i4l/isdn_ppp.c
In file included from drivers/isdn/i4l/isdn_ppp.c:22:
drivers/isdn/i4l/isdn_ppp_mp.h: In function `ippp_mp_xmit':
drivers/isdn/i4l/isdn_ppp_mp.h:47: too many arguments to function `ippp_xmit' make[4]: *** [drivers/isdn/i4l/isdn_ppp.o] error 1
make[3]: *** [drivers/isdn/i4l] error 2
make[2]: *** [drivers/isdn] error 2
make[1]: *** [drivers] error 2
make: *** [modules] error 2

Is this a known problem?
I just wanted to test 2.5.

regards,
Felix T.

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