iscsi: too few arguments to netlink_kernel_create

While compiling the kernel module for iscsitarget-0.4.15 on linux-2.6.22.9 I got this error:
/tmp/IET/iscsitarget-0.4.15/kernel/event.c: In function "event_init":
/tmp/IET/iscsitarget-0.4.15/kernel/event.c:98: warning: passing argument 4 of "netlink_kernel_create" from incompatible pointer type
/tmp/IET/iscsitarget-0.4.15/kernel/event.c:98: error: too few arguments to function "netlink_kernel_create"

The signature of the netlink_kernel_create in kernel 2.6-22.9 (in /usr/src/linux/include/linux/netlink.h) is:
extern struct sock *netlink_kernel_create(int unit, unsigned int groups,
                                          void (*input)(struct sock *sk, int len),
                                          struct mutex *cb_mutex,
                                          struct module *module);


The problem was solved by changing line 98 in the iscsi-target source of kernel/event.c :
nl = netlink_kernel_create(NETLINK_IET, 1, event_recv, THIS_MODULE);
to
nl = netlink_kernel_create(NETLINK_IET, 1, event_recv, 0, THIS_MODULE);