mtpd: Set FD_CLOEXEC on signal pipe.
diff --git a/mtpd.c b/mtpd.c
index 5ae2bca..0be22f0 100644
--- a/mtpd.c
+++ b/mtpd.c
@@ -171,6 +171,8 @@
         log_print(FATAL, "Pipe() %s", strerror(errno));
         exit(SYSTEM_ERROR);
     }
+    fcntl(signals[0], F_SETFD, FD_CLOEXEC);
+    fcntl(signals[1], F_SETFD, FD_CLOEXEC);
 
     timeout = initialize(argc, argv);