commands: add additional check to lxc_cmd_sock_get_state()

to please Coverity.

Fixes: Coverity 1461732.
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

src/lxc/commands_utils.c

@@ -62,11 +62,14 @@ int lxc_cmd_sock_get_state(const char *name, const char *lxcpath,
 
 	ret = lxc_cmd_add_state_client(name, lxcpath, states, &state_client_fd);
 	if (ret < 0)
-		return -1;
+		return ret_errno(EINVAL);
 
 	if (ret < MAX_STATE)
 		return ret;
 
+	if (state_client_fd < 0)
+		return ret_errno(EBADF);
+
 	return lxc_cmd_sock_rcv_state(state_client_fd, timeout);
 }