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, 1 deletions

diff --git a/crypto/af_alg.c b/crypto/af_alg.c
index 6a3ad8011585..bc21f520d489 100644
--- a/crypto/af_alg.c
+++ b/crypto/af_alg.c
@@ -399,7 +399,7 @@ int af_alg_cmsg_send(struct msghdr *msg, struct af_alg_control *con)
 {
         struct cmsghdr *cmsg;
 
-        for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
+        for_each_cmsghdr(cmsg, msg) {
                 if (!CMSG_OK(msg, cmsg))
                         return -EINVAL;
                 if (cmsg->cmsg_level != SOL_ALG)