blkdiscard: make it NOEXEC

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/NOFORK_NOEXEC.lst b/NOFORK_NOEXEC.lst
index 9735e75..ab58df5 100644
--- a/NOFORK_NOEXEC.lst
+++ b/NOFORK_NOEXEC.lst
@@ -49,7 +49,7 @@
 base64 - runner
 basename - NOFORK
 beep
-blkdiscard
+blkdiscard - noexec. leaks: open+xioctl
 blkid - noexec
 blockdev - noexec. leaks fd
 bootchartd - daemon