tests: change netlink_protocol.test to trace sendto syscalls only

* tests/gen_tests.in (netlink_protocol): Replace %network with sendto.
* tests/netlink_protocol.c (main): Update expected output.

tests/gen_tests.in

@@ -184,7 +184,7 @@ munlockall	-a13
 nanosleep	-a20
 net-icmp_filter	-e trace=getsockopt,setsockopt
 net-sockaddr	-a24 -e trace=connect
-netlink_protocol	-e trace=%network
+netlink_protocol	-e trace=sendto
 newfstatat	-a32 -v -P stat.sample -P /dev/full
 old_mmap	-a11 -e trace=mmap
 oldfstat	-a18 -v -P stat.sample

tests/netlink_protocol.c

@@ -375,12 +375,8 @@ int main(void)
 	if ((fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_SOCK_DIAG)) == -1)
 		perror_msg_and_skip("socket AF_NETLINK");
 
-	printf("socket(AF_NETLINK, SOCK_RAW, NETLINK_SOCK_DIAG) = %d\n",
-	       fd);
 	if (bind(fd, (struct sockaddr *) &addr, len))
 		perror_msg_and_skip("bind");
-	printf("bind(%d, {sa_family=AF_NETLINK, nl_pid=0, nl_groups=00000000}"
-	       ", %u) = 0\n", fd, len);
 
 	char *path;
 	if (asprintf(&path, "/proc/self/fd/%u", fd) < 0)