Instead of sendto() and recvfrom() which the NL address that was already
provided before.

Just simpler and easier to read without the to/from variants.

While at it, fix a checkpatch warning by removing multiple assignments.

Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
---
v2: fix already present checkpatch warning.
---
 tools/testing/selftests/net/mptcp/pm_nl_ctl.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/tools/testing/selftests/net/mptcp/pm_nl_ctl.c b/tools/testing/selftests/net/mptcp/pm_nl_ctl.c
index 99eecccbf0c8..78180da1efcc 100644
--- a/tools/testing/selftests/net/mptcp/pm_nl_ctl.c
+++ b/tools/testing/selftests/net/mptcp/pm_nl_ctl.c
@@ -217,8 +217,6 @@ static int capture_events(int fd, int event_group)
 /* do a netlink command and, if max > 0, fetch the reply ; nh's size >1024B */
 static int do_nl_req(int fd, struct nlmsghdr *nh, int len, int max)
 {
-	struct sockaddr_nl nladdr = { .nl_family = AF_NETLINK };
-	socklen_t addr_len;
 	void *data = nh;
 	int rem, ret;
 	int err = 0;
@@ -230,15 +228,15 @@ static int do_nl_req(int fd, struct nlmsghdr *nh, int len, int max)
 	}
 
 	nh->nlmsg_len = len;
-	ret = sendto(fd, data, len, 0, (void *)&nladdr, sizeof(nladdr));
+	ret = send(fd, data, len, 0);
 	if (ret != len)
 		error(1, errno, "send netlink: %uB != %uB\n", ret, len);
 
-	addr_len = sizeof(nladdr);
-	rem = ret = recvfrom(fd, data, max, 0, (void *)&nladdr, &addr_len);
+	ret = recv(fd, data, max, 0);
 	if (ret < 0)
 		error(1, errno, "recv netlink: %uB\n", ret);
 
+	rem = ret;
 	/* Beware: the NLMSG_NEXT macro updates the 'rem' argument */
 	for (; NLMSG_OK(nh, rem); nh = NLMSG_NEXT(nh, rem)) {
 		if (nh->nlmsg_type == NLMSG_DONE)

-- 
2.53.0