[PATCH bpf-next] bpfilter: Fix mismatch in function argument types

Fix following warning:
net/ipv4/bpfilter/sockopt.c:28:5: error: symbol 'bpfilter_ip_set_sockopt' redeclared with different type
net/ipv4/bpfilter/sockopt.c:34:5: error: symbol 'bpfilter_ip_get_sockopt' redeclared with different type

Signed-off-by: YueHaibing <redacted>
---
 include/linux/bpfilter.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/linux/bpfilter.h b/include/linux/bpfilter.h
index 687b176..43acfa8 100644
--- a/include/linux/bpfilter.h
+++ b/include/linux/bpfilter.h

@@ -5,9 +5,9 @@
 #include <uapi/linux/bpfilter.h>
 
 struct sock;
-int bpfilter_ip_set_sockopt(struct sock *sk, int optname, char *optval,
+int bpfilter_ip_set_sockopt(struct sock *sk, int optname, char __user *optval,
 			    unsigned int optlen);
-int bpfilter_ip_get_sockopt(struct sock *sk, int optname, char *optval,
+int bpfilter_ip_get_sockopt(struct sock *sk, int optname, char __user *optval,
 			    int *optlen);
 extern int (*bpfilter_process_sockopt)(struct sock *sk, int optname,
 				       char __user *optval,