conf: always close pipe in run_userns_fn()

src/lxc/conf.c

@@ -4063,6 +4063,7 @@ struct userns_fn_data {
 
 static int run_userns_fn(void *data)
 {
+	int ret;
 	char c;
 	struct userns_fn_data *d = data;
 
@@ -4072,14 +4073,14 @@ static int run_userns_fn(void *data)
 	/* Wait for parent to finish establishing a new mapping in the user
 	 * namespace we are executing in.
 	 */
-	if (lxc_read_nointr(d->p[0], &c, 1) != 1)
-		return -1;
-
+	ret = lxc_read_nointr(d->p[0], &c, 1);
 	/* Close read end of the pipe. */
 	close(d->p[0]);
+	if (ret != 1)
+		return -1;
 
 	if (d->fn_name)
-		TRACE("calling function \"%s\"", d->fn_name);
+		TRACE("Calling function \"%s\"", d->fn_name);
 
 	/* Call function to run. */
 	return d->fn(d->arg);