net: introduce helper macro for_each_cmsghdr

Introduce helper macro for_each_cmsghdr as a wrapper of the enumerating
cmsghdr from msghdr, just cleanup.

Signed-off-by: Gu Zheng <guz.fnst@cn.fujitsu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 2 deletions

diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index c92f96cda699..2625eccb77d5 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -6592,8 +6592,7 @@ static int sctp_msghdr_parse(const struct msghdr *msg, sctp_cmsgs_t *cmsgs)
         struct cmsghdr *cmsg;
         struct msghdr *my_msg = (struct msghdr *)msg;
 
-        for (cmsg = CMSG_FIRSTHDR(msg); cmsg != NULL;
-             cmsg = CMSG_NXTHDR(my_msg, cmsg)) {
+        for_each_cmsghdr(cmsg, my_msg) {
                 if (!CMSG_OK(my_msg, cmsg))
                         return -EINVAL;