safe_open_ex: add a comment about why O_PATH doesn't work.

diff --git a/src/libadacl.c b/src/libadacl.c
index 21b8141cbbc0158a3c6cfce3e985838bed1e20ce..01cb4adaea9ebef67d9358b6ac1b5555dc452500 100644 (file)
--- a/src/libadacl.c
+++ b/src/libadacl.c
@@ -40,6 +40,9 @@
  *   open a file descriptor in a symlink-safe way when combined with
  *   the @c O_NOFOLLOW flag.
  *
+ * The @c O_PATH flag is not used because we want to fail upon
+ * encountering any symlinks.
+ *
  * @param at_fd
  *   A file descriptor relative to which @c pathname will be opened.
  *