check: Warn *diag absense always

To know what exactly is missing.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

cr-check.c

@@ -501,7 +501,7 @@ int cr_check(void)
 {
 	int ret = 0;
 
-	log_set_loglevel(LOG_ERROR);
+	log_set_loglevel(LOG_WARN);
 
 	if (mntns_collect_root(getpid())) {
 		pr_err("Can't collect root mount point\n");

sockets.c

@@ -607,9 +607,8 @@ int collect_sockets(int pid)
 					PACKET_SHOW_FANOUT | PACKET_SHOW_RING_CFG;
 	tmp = do_collect_req(nl, &req, sizeof(req), packet_receive_one, NULL);
 	if (tmp) {
-		if (pid != 0 && tmp == -ENOENT) /* Fedora 19 */
-			pr_warn("The current kernel doesn't support packet_diag\n");
-		else
+		pr_warn("The current kernel doesn't support packet_diag\n");
+		if (pid == 0 || tmp != -ENOENT) /* Fedora 19 */
 			err = tmp;
 	}
 
@@ -618,9 +617,8 @@ int collect_sockets(int pid)
 	req.r.n.ndiag_show	= NDIAG_SHOW_GROUPS;
 	tmp = do_collect_req(nl, &req, sizeof(req), netlink_receive_one, NULL);
 	if (tmp) {
-		if (pid != 0 && tmp == -ENOENT) /* Going to be in 3.10 */
-			pr_warn("The current kernel doesn't support netlink_diag\n");
-		else
+		pr_warn("The current kernel doesn't support netlink_diag\n");
+		if (pid == 0 || tmp != -ENOENT) /* Going to be in 3.10 */
 			err = tmp;
 	}