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, 3 deletions

diff --git a/net/iucv/af_iucv.c b/net/iucv/af_iucv.c
index 1cd3f8107239..2e9953b2db84 100644
--- a/net/iucv/af_iucv.c
+++ b/net/iucv/af_iucv.c
@@ -1070,9 +1070,7 @@ static int iucv_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
         txmsg.class = 0;
 
         /* iterate over control messages */
-        for (cmsg = CMSG_FIRSTHDR(msg); cmsg;
-                cmsg = CMSG_NXTHDR(msg, cmsg)) {
-
+        for_each_cmsghdr(cmsg, msg) {
                 if (!CMSG_OK(msg, cmsg)) {
                         err = -EINVAL;
                         goto out;