zdtm: use pr_err if errno isn't required

205             if (fd < 0) {
>>> >>>     CID 175317:    (PW.BAD_PRINTF_FORMAT_STRING)
>>> >>>     invalid format string conversion
206                     pr_perror("can't accept client connection %m");

travis-ci: success for zdtm: use pr_err if errno isn't required
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

test/zdtm/static/socket-tcp-close-wait.c

@@ -203,13 +203,13 @@ int main(int argc, char **argv)
 	 */
 	fd = tcp_accept_server(fd_s);
 	if (fd < 0) {
-		pr_perror("can't accept client connection %m");
+		pr_err("can't accept client connection");
 		return 1;
 	}
 
 	ctl_fd = tcp_accept_server(fd_s);
 	if (ctl_fd < 0) {
-		pr_perror("can't accept client connection %m");
+		pr_err("can't accept client connection");
 		return 1;
 	}