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nlplug-findfs: make sure we dont leak fd when execute lvm

--- a/nlplug-findfs.c

+++ b/nlplug-findfs.c

@@ -732,7 +732,7 @@

 	if (!recurse_push(opts, &oldlen, "uevent"))

 		return;

-	fd = open(opts->path, O_WRONLY);

+	fd = open(opts->path, O_WRONLY | O_CLOEXEC);

 	if (fd >= 0) {

 		write(fd, "add", 3);

 		close(fd);

@@ -799,7 +799,7 @@

 {

 	int fd;

 	if (outfile == 0) return;

-	fd = open(outfile, O_WRONLY | O_CREAT | O_APPEND);

+	fd = open(outfile, O_WRONLY | O_CREAT | O_APPEND | O_CLOEXEC);

 	if (fd == -1)

 		err(1, "%s", outfile);

 	write(fd, data, strlen(data));