rexec: avoid double-close

src/lxc/rexec.c

@@ -143,7 +143,7 @@ static void lxc_rexec_as_memfd(char **argv, char **envp, const char *memfd_name)
 		if (fcntl(memfd, F_ADD_SEALS, LXC_MEMFD_REXEC_SEALS))
 			return;
 
-		execfd = memfd;
+		execfd = move_fd(memfd);
 	} else {
 		char procfd[LXC_PROC_PID_FD_LEN];